A script to add the most helpful Steam review to the front page

Steam Reviews Javascript

// Initial definitions
var now = new Date().getTime();
var ten_seconds = 10 * 1000;
var one_day = 86400 * 1000;
var one_week = one_day * 7;


// Remove any pre-existing summary elements
jQuery(".summary-element").remove();


// Add the content depending on the result
function considerContent(url, matchingElements, content) {
}


// Define how we add summary elements to deal divs
function addOverview(element, content) {
    var div = jQuery("<div class='summary-element' />");
    div.css({
        position: "absolute",
        top: 0,
        left: 0,
        width: "100%",
        "line-height": "1.1em",
        "font-size": "12px",
        "text-shadow": "1px 1px 1px #000",
        "z-index": 399,
        background: "rgba(0,0,0,0.7)"
    });

    if (content.reviews) {
        jQuery.each(content.reviews, function(index, review) {
            var element = jQuery("<img />");
            element.prop("src", review.thumbSrc);
            element.css({
                float: "right",
                background: "rgba(0,0,0,0.7)",
                width: "11px",
                height: "11px"
            });
            element.prop("title", review.content);
            div.append(element);
        });
    }

    if (content.steamAggregateSummary !== undefined) {
        var pSteamAggregate = jQuery("<p />");
        pSteamAggregate.css({
            "white-space": "nowrap",
            "font-weight": "bold"
        });
        if (content.steamAggregateSummary == "Mixed") pSteamAggregate.css("color", "#A34C25");
        else if (content.steamAggregateSummary.indexOf("Positive") !== -1) pSteamAggregate.css("color", "#66C0F4");
        pSteamAggregate.text("Steam Reviews: " + (content.steamAggregateSummary || "None"));
        pSteamAggregate.prop("title", content.steamAggregateText);
        div.append(pSteamAggregate);
    }

    if (content.metacriticScore) {
        var pMetaCritic = jQuery("<p />");
        pMetaCritic.text(content.metacriticScore + "% on MetaCritic");
        div.append(pMetaCritic);
    }

    if (content.drmNotices) {
        var pDrmNotices = jQuery("<p />");
        pDrmNotices.text(content.drmNotices);
        if (content.requiresUPlay) pDrmNotices.css({
            color: "#f66",
            "font-weight": "bold"
        });
        div.append(pDrmNotices);
    }

    if (!content.reviews.length) {
        div.css({background: "rgba(255, 255, 0, 0.5)", height: "100%"});
    } else if (
        (content.reviews[0].thumbSrc.indexOf("thumbsDown") !== -1)
        || (content.steamAggregateSummary === undefined)
        || (content.steamAggregateSummary.toLowerCase().indexOf("positive") === -1)
        || (content.requiresUPlay)
    ) {
        div.css({background: "hsla(19, 64%, 30%, 0.8)", height: "100%"});
    }

    element.append(div);
}

var urls = {};
jQuery("a[href^='http://store.steampowered.com/app/']").css({position: "relative", display: "inline-block"}).each(function() { 
    var element = jQuery(this);
    var domElement = element.get(0);
    var url = [domElement.protocol, '//', domElement.host, domElement.pathname].join('');
    urls[url] = true;
})

// Stronger colouration on good discounts
jQuery(".discount_pct").filter(function() {
    return parseInt(jQuery(this).text()) <= -60;
}).css({
    background: "rgb(0, 255, 0)",
    "font-weight": "bold"
});
jQuery(".discount_pct").filter(function() {
    return parseInt(jQuery(this).text()) > -20;
}).css({
    background: "rgb(163, 76, 37)",
});

// Attach our extra content to each block
jQuery.each(urls, function(url) {
    var matchingElements = jQuery("a[href^='"+url+"']");
 
    // Try to use the cached value
    var timedContent = localStorage[url] ? JSON.parse(localStorage[url]) : null;
    if (timedContent && timedContent.expires > now) {
        jQuery.each(matchingElements, function(index, element) {
            addOverview(jQuery(element), timedContent);
        });
    }

    // Otherwise, getting the linked page's content and parse it out
    else {
        jQuery.get(url, function(data) {
            var remotePage = jQuery(data);
            var content = {};
            if (jQuery("#agecheck_form", remotePage).length) {
                content.expires = now + ten_seconds;
            } else {
                content.expires = now + one_week;
                content.steamAggregateSummary = jQuery("div[itemprop=aggregateRating]", remotePage).find(".game_review_summary").text();
                content.steamAggregateText = jQuery("div[itemprop=aggregateRating]", remotePage).data("store-tooltip");
                content.metacriticScore = jQuery("#game_area_metascore span", remotePage).first().text();
                content.reviews = jQuery("#Reviews_all .review_box", remotePage).map(function() {
                    var review = jQuery(this);
                    response = {};
                    response.thumbSrc = review.find(".thumb img").prop("src");
                    response.content = review.find(".content").text().trim();
                    return response;
                });
                content.drmNotices = jQuery(".DRM_notice", remotePage).text().trim().replace(/\s{2,}/g, '; ');
                content.requiresUPlay = (
                    jQuery(".game_area_sys_req_full", remotePage).text().toLowerCase().indexOf("uplay") !== -1
                    || content.drmNotices.toLowerCase().indexOf("uplay") !== -1
                    || content.drmNotices.toLowerCase().indexOf("drm") !== -1
                );
            }
            localStorage[url] = JSON.stringify(content);
            jQuery.each(matchingElements, function(index, element) {
                addOverview(jQuery(element), content);
            });
        });
    }
});

Most recent changes brings over review summaries, metacritic scores, helpful reviews, UPlay warnings.

Easily converted into a bookmarklet via https://chriszarate.github.io/bookmarkleter/

To bypass age verification, visit an age verification page which will set your cookie then run the script again.

Not sure what to do about bundle packs...