to say "its to soon" is simply not true. most games that get Released�will have reviews ready the day of the Release(some of them sooner). the developer usually gives a copy of the game several days before the launch so thy will have time to play it and write and Release�a review in the intended Release�date. apparently larian studio choose not to do that for some odd reason and its a shame, a good review will go a long way in helping the sales of the game.
here is an example from another "small and unknown" rpg game that had plenty pf reviews on the release day:
http://www.metacritic.com/game/pc/the-elder-scrolls-v-skyrim/critic-reviewsanybody can disagree that if a game this huge can have reviews ready on Release�day there is no excuse for other rgp games not to have them?
Ask yourself the simple question: If you have sold quite a substantial amount of units already via kickstarter and early access, would you delay the release of the game for about 4 weeks, so that reviewers can test your release version of the game?
If reviews are important for you, you have to wait, if not you can buy now. It really is that simple, and as there are quite a lot early access impressions from all major review sites you can chose to read them too, if you prefer an quick review over a more detailed one.