Most people who write these reviews are morons.
I've played the final game more than most of the jokers on the board who are either reviewing the Beta version (it's beta you HARBL-heads), or played the full game for 5 minutes and then ran online to be the first to slam it. I won a copy last week, so I've sunk lots of hours in and I can honestly say that you will probably either love the game or you will wish you stayed with BF2. To me the game is a mix on many fronts. I personally love the Titan mode, and while the battles on the ground play out just like Conquest, the battles in the Titans are awesome. I think the unlock system is perfectly paced and rewarding, but can definitely understand how it screws things up for the competitive community. I like that the weapons and vehicles are still grounded in reality, and sound awesome, but think that until you get a few unlocks many of them lack variety. In some cases vehicles have had some of the bite taken out of them (Gunships I'm talking about you) but that actually makes it easier for non-super-hardcore-don't-play-50-hour-a-day guys like me to fly them.
By the same token, you'll either like the future setting or you will not. But why go online screaming about how DICE shouldn't have made the move to the future? Why don't we just ask them to build the same game over and over again just so you can be happy?
Bottom line, there's a demo out. I give the game an 8.6, but try it out for yourself and see if it's for you. If you like the demo, odds are you'll be happy to spend $50. If you don't like the demo, guess what? I just saved you $50. So you can always send me a small donation if this is the case...;)