Okay, here's what I think.
Overall, quite a good movie. It succeeded in more ways than it failed, all the acting I thought was pitch perfect, and I don't get why you wouldn't like Liv Tyler's performance. The action sequences were impeccable, and it was great to see the Hulk as powerful as he ought to be. Basically everything is better than it was in Ang Lee's Hulk.
The best thing about this? Edward Norton. He makes a fantastic Bruce Banner and manages to sound smart, crack a few jokes, and pulls off a fantastic job of making Bruce a likable character who you really give a damn about.
Tim Roth as Emil Blonsky was great as well... I love the bits alluding to Captain America, especially the fact that the serum they inject him with is comes from a project called "Weapons Plus". It seems like they are mixing 616 and Ultimate continuity here... Steve Rogers seems to be the beginnings of the Weapons Plus program (probably Weapon I), and the Hulk has come out of a later variation of that same program. I bet when they get the X-Men rights back, they'll more than likely tie Wolverine in there too. It's all about building the next Super-Soldier. I can't wait to see the cut scene with the Hulk in the Arctic running into frozen Captain America. They're really doing a great job building this universe.
At first I was a little bummed out that Mr. Blue wasn't Doc Samson, but instead this guy I had never heard of, a Dr. Samuel Sterns. But when that Abomination blood trickled into a head injury, it hit me that this guy is the Leader. I like the nod to comics continuity, but hate the casting here. I mean, Tim Blake Nelson was great as the idiot in O Brother Where Art Thou? but in general he doesn't pull off the feeling of an educated professor, and I especially don't think he'd be able to pull off The Leader.
I was also upset with the fact that in an interview Edward Norton said that they would be exploring the whole concept that The Hulk and Banner are aware of eachother and hate eachother. There is none of that in the movie. Maybe it was cut, or maybe it was just supposed to come out in the acting. Banner sure doesn't like The Hulk, but it seems like The Hulk is pretty much unaware of the fact he turns back into a "Puny Human" when he calms down.
Let's see... somewhere between 7.5 and 8/10 Let me think on it a little.
EDIT: Apparently Betty Ross' boyfriend is Leonard Samson? I thought he might be, but she never refers to him by name, nor does anybody in the cast. Not even a "Len" or a "Dr. Samson". They just mention that he's a Psychologist. Or as the character in the film puts it, a "head-shrinker".