Hrm, I'll be honest then, you're the very very first time I hear someone wanting to consume game reviews meta aggregation in a chronological way (instead of by-game). Not once seen this sentiment before.

I dunno, it's just not how people use these pages I would assume. You create search shortcuts for them, not RSS feeds. You want to look up what various reviewers at large say about a specific game, more so because this changes over time (so would a feed udoate each time the score changes? Only once on the very first review? Only once it stops updating for X time? What if that takes months?). It's the polar opposite of once you have 2-3 reviewers who mirror your personal take well where you might want to know each time these people post a new review.

There's no exact point in time at which "the aggregated reviews" are one finished article of news. One bootlicking review site will have its review of a game out in the first 3 hours to be the first place people read. Then, another detailed reviewer will spend a week investigating the game's systems before providing a more nuanced review.