I don't know whats with all the hate this game got when it was first released (the reason why I didn't pick it up at first), but after playing through 2 campaigns, I have to say that this game is really fun. Sure it has drifted away from classic RE, but it doesn't mean it's not fun. It definitely didn't change for the worse like Halo 4.
i was just thinking the exact same thing! i avoided it like the plague because of reviews til now. Got it for 20 bucks 2 days ago when they had that sale. SO GOOD! im almost done with leons campaign im playing on veteran and I am at like 6 or so hours. that is long for just one campaign. I take my time tho. I am absolutely loving mercenaries and im making my brother buy this game now too haha!
Favorite thing has to be the counters in this game; I was an avid fan of the Onimusha series and loved doing the "counters" there as well. Oh, and now you can roll out of the way too, so that's another mechanic that's been adding to my fun.