the advtage the steam system has is first the bought game/gifted game situation, as well as the more important factor, the recent opinion score, as at amy given momemt a game can get good because of a major change (e. g payday 2 reverting all the pay 2 win content the original publisher mandated) or gone to shit because of greed or a bad patch.
the problem users have is finding a curator that has a similar taste in games that they do. If I was a fan of JRPGs, im not going to care about the opinion on some person who doesnt really play jrpgs. at the same time, if you like some niche genre, to the general public, that niche is always less popular, so itll get worse ratings thanit should compared to people who enjoy said niche.
the idea of it improving battery is that generating frames is less performance intensive than running a certain framerate (e.g 60 fps capped game with frame gen at double the framerate consumes less power than running the same game at 120 fps). though its slightly less practical because frame generation only makes sense when the base framerate is high enough (ideally above 60) to avoid a lot of screen artifacting. So in practical use, this only makes sense to “save battery” in the context that you have a 120hz+ screen and choose to cap framerate to 60-75fps.
If one is serious about minmaxing battery to performance in a realistic value, people should have the screen cap at 40 hz, as it has half of the input latency between 30 and 60 fps, but only requires 10 more fps than 30 which is a very realistic performance target for maintaining a minimum on handheld.