No, this game is not the messiah. No, you will not be happy if you only want to PvE. It will not dethrone WoW and the class that you wanted to play is not in the game (Hammerer, Choppa, Knight of the Blazing Sun, Blackguard).
What this game does do though, it does very well. Warhammer puts the Multi Massive back into the Online Role Playing Games. The moment you leave your newbie town and see 20 completely random people who may not even know each other, working together to complete a common goal, a smile will probably pop up on your face. When you enter a new zone and see that there are 2 Warbands nearby, one PvEing and one RvRing nearby you, each 10 minutes away, and you don't have to beg for an invite, you'll probably " Woah " in disbelief. When you enter your first Battle Camp and see the red swords crossed only minutes away, and the call for help in your local defense channel, you'll feel patriotic and want to defend your control points. When you take control of your first Hell Cannon and launch a barrage of green goo at your enemies in a first person shooter mode, you'll likely shit bricks. Simply put, you will basically be incapable of NOT finding a group.
Keep Sieges, Living Guilds, Open Parties, Public Quests. These are all key words you have all heard before, talked about in videos, rumored innovations that no one has quite seen yet outside of beta. These are all existing in the game. A Living Breathing guild system, that actually levels up with its members. Open parties where YOU look for THEM and join, not the other way around! (Unless you want of course). Public Quests which are continuously happening, allowing even the casual guy to spend 15 minutes for an epic piece of loot if he works hard enough, or hell even gets lucky enough!
The last generation of MMO's we have seen focus on making the game easier for casuals, but this was mostly achieved in a means that made playing your MMO, less Massive. Pick this up here, collect 20 of that there, grind these here. People wanted these things because they wanted to experience an MMO, but not have to put 30 hours a week into being somebody. People didn't want to PvP at low level on their first character, because they weren't leveling if they were!
In Warhammer you WANT to group. You want to RvR in the world, or do a scenario with your real life friends. You go out of your way to help other people with their Public Quests, even if you already have maximum influence for that area, because who knows? You might just be lucky and get the #1 Roll for a bag with a purple item in it you don't have. Maybe you just want the money?
Say what you want about the graphics, or how similar it is to WoW's. How DAoC is a failure in your eyes, or how Darkfall can do it better. I'll be playing Warhammer, enjoying all the hard work that Mythic has put into making this great game, with my friends and also making new ones in this new community experience.
By the way this thread can be opened up for a Q&A session if you want. I'm an Elder tester.