I had a run of games a while back that were next to unplayable for the first 6 months while the bugs got ironed out and the patches got patched. Now I just wait 6 months or so (bonus - they're generally heavily discounted by then, haha) - if games critics are reviewing new releases but gamers reviews come in over the lifetime of the game, they're kind of reviewing two different products and it would make sense if critics' reviews were harsher.