Well, for starters, from live to beta I lost 10-12% crit. They changed the agi:crit ratio from 25:1 to 40:1, which is huge. However, the change to Predatory Strikes meant I had 400-500 more AP.
Grinding feels about the same overall. It does take me considerably longer to kill things, but I'm pretty sure that's because Northrend mobs have significantly more HP than Outlands mobs. Tiger's Fury is worth using now, since it's free and off the GCD. Rake is actually worth using (once you get the new rank), in large part because of the synergy between it and the new talent Rend and Tear (+50% crit for FB on a bleeding target). However, you can ignore both of them and not really notice a difference in grinding speed.
Feral Charge (Cat) is fun but useless. I would like it to grant some sort of increased damage on the next attack, like Shadowstep, but that would probably be something of an affront to rogues. As it stands, it's almost purely a PvP skill.
Berserk is weird. It's not good enough to be a 51 point talent. It does lots of stuff, but you'll never want all that stuff at the same time. If you really need to break a stun or fear, fine, but you'd better not need Last Stand anytime in the next five minutes. This sort of tradeoff encourages you not to use it, lest you really need it in a couple minutes. I'm not sure what to suggest here, but it feels pretty lackluster right now. Right now I only use it for bear form AoE while grinding.
It also seems like they changed the rage generation formula so that bears get less rage from damage dealt. (I realize that this naturally happens as you increase in level, but there's more going on than just that.) This was one of the strong points of bear offtanks -- we could generate a significant amount of rage without taking much damage. As such, it's a little frustrating.
<Viserys> I'm sitting here slapping someone's ass
<Viserys> and there's no gratification