It was as I expected, which was that it would be a rather pedestrian story that was a delight. Spoilers below, gentlemen.
And it was a delight, indeed. Is it better than IRON MAN? I think so. I'm of the same opinion as Gothamite and Planet-Man.
As everyone knows, Helmsworth is stellar and carries the entire film. He's terrific; he's cocky and reckless, yet a wise king and it works. The warriors three and Sif are all fun, except for Hogun who kinda only stands out because he's the only Asian in the movie; Sif is the most badass of the foursome (the way she skewers the Destroyer is terrific), Fandral shines, and Volstagg is rather funny. Hopkins is a great Odin, Idris Elba is wonderful as Heimdall, Selvig and Darcy are great, and then.... there's Tom Hiddleston's Loki.
Here's what I think was surprising about THOR: firstly, how funny it was. The horse, another drink, and Portman hitting him with her car for a second time. Hell, I laughed when I saw Thor striding through the center of the road. Secondly, I don't think anyone expected to be so empathetic towards Loki. Maybe that's just me, but I found myself really engaged, emotionally, with Loki. He wasn't the "kickass villain" (and I love kickass villains) but rather this tragic secondary protagonist and wow, did it work.
And a someone who wanted Ultimate Thor, as in, "Is he really a god?", they threw that out the window so they could have comedy. Which is terrific, because it worked. If I didn't get the Thor I wanted, I'm glad that the Thor they made was wonderful enough to make me not go, "Poo. It's not my Thor." Fantastic.
Yet, I have two problems with the film: The first is Portman. I'm not a fan of her, but really, the problem was Janice Foster. I liked that she was totally into Thor, but I never bought that Thor would be into her. Now, while that might just be me, one of the problems is that the love story never really goes anywhere yet it is central to the climax of the story. I think their relationship should've been more intense (not in a steamy sexy way but rather more should have happened in their relationship - what, I don't know, it should've been a proper sub-plot and it was kinda lackluster). And another problem was that there was no need for Foster and Darcy. They could've easily been the same character, and they should've been. All the stuff Darcy does should've been given to Foster because Darcy was far more entertaining and I think, if Foster was enthralled but scared of Thor (tasering him) and treated him like an oddity (facebook), it would've been more compelling. That's not a slight to either actress though; they were fine.
The second problem is the same problem I had with STAR TREK and IRON MAN and THE INCREDIBLE HULK - it has a poopy story. The story isn't bad, it's just a cliche. We've seen it all before. Once Thor stands up and sacrifices himself to the Destroyer, I just sat back and while I still enjoyed myself, I had seen everything before and I knew what was going to happen long before it did and it was just a going through the motions experience. "Been there, done that."
Despite that, THOR and the other three films work, they're fun. And the reason is that not only are they wonderfully told, but the main actor (Pine, Downey Jr, Norton, Helmsworth) is so engaging emotionally that you kinda don't mind the fact that you've seen the story before because you haven't seen them before. And THOR had a two-fer because Loki is so wonderful, and THOR really had terrific pace and structure. It's all very well done. But: it's a cliche. Cliches work, that's why they get used again and again, and this movie did them very well, but the fact that it's unoriginal is why you go, "That was so much fun... but it wasn't THE DARK KNIGHT." That's what separates Dreamworks from Pixar; Dreamworks is just unoriginal. Fun, but unoriginal. THOR is as good as 'unoriginal' can get. So bravo to them.
Hell, even when I knew everything, it still surprised me: I applauded when Thor put his hammer on Loki. I had never seen that before, and it was terrific. And man, Bifrost was one of the best things I'd seen.
All in all, an absolute joy, and the best Marvel movie to date. I'd have to watch IRON MAN to be doubly sure.