No matter how deep you do the research about a certain Early Access game, in the end it's still "Buy at your own risk". I've seen Early Acces games that made it out to full release with overall positive reviews, such as Darkest Dungeon, and the ones that were either a.) empty promises, b.) the content of the full release is just as much (or lacking) as while it was in Early Access (eg. Graveyard Keeper), c.)total change of direction from revolutionary-sounding idea into something that we have enough of (eg. Wolcen: Lord of Mayhem).

For me, I think it's better to wait until the full release or at least when the game got "Very positive" review in Early Access. And even so, it's still good to read the handful of the negative reviews, because if you can find the good one with objective judgment you can consider if the current flaws of the game won't bother you too much.