Not only wait for the reviews, but wait for the hype to die down a little.

When Destiny 2 released, the entire playerbase was super positive about it - it fixed everything that was wrong with the first game, they said. After a couple of weeks, some players started mentioning there was no real endgame, nothing to chase because of the fixed loot rolls, etc, and that they felt "done" with the game after 80 hours or so. Everyone else told them to shut up, obviously they were burnt out after playing 80 hours in two or three weeks. And then a couple of weeks later, everyone else started to hit the same point - they had their perfect gear already, they'd done all the content, there was nothing left to see.

Watching a game go from incredibly positive reception to a fairly jaded, luke-warm-at-best reception over the course of ~5 weeks with nothing about the game changing was quite something. And it basically showed me I should wait a few months at minimum for hype to die down and the opinions to settle before I think about buying a game. That said, I'm a patient gamer anyway and usually wait far longer than that anyway, but yeah, I think Destiny 2 perfectly illustrates why you should wait longer for a community consensus.

Yeah there's currently cities skylines II and another game that I'm currently waiting on dropping their price or stellar reviews before I buy them.