Well we may just have to agree to disagree (not that there's anything wrong with that), but I, personally, didn't see it as out of character at all. I saw it as a deeper look into the character. If Bruce doesn't like or admire or need some aspect of Hulk, then there really isn't any conflict. Same goes for Hulk. One or the other would just take over and that would be that. Something keeps the internal battle brewing, and it is that need that makes the hate so strong.
In the film, it was obvious (to me anyway) that Bruce didn't think it was a barrel of laughs turning into the Hulk; it obviously scared him. His reference to 'liking it," IMO was more about liking the power and more importantly the freedom. Plus, when he mentioned 'liking it' it was only after the first transformation...he seemed to remember more about being Hulk with every transformation. And his first instinct, when goaded by his father, was to "isolate and kill it," so I guess he didn't like it THAT much.
Look, we've got over 40 years of history including several different directions various writers have taken the character including a few ret cons and different incarnations (most of which I don't particularly care for, I'm a Green Savage Hulk kinda gal) not to mention cartoons and TV (which is arguably the most commercially successful version, and yet does not contain a bomb origin or most of the other things so many people gripe at the film for). Personally I think Ang Lee did a really good job pulling all that history together into what I felt kept the essence of Banner and Hulk in tact. Despite what you may think about the artsy farsty nature of the film, I do think Ang Lee respected the character and kept it in mind throughout the production. I don't think Stan Lee ever intended or concieved of Banner having MPD or there being a ton of different 'Hulks' as has happened over the years. It began as a Jeckyll and Hyde type story and that's the string that holds it all together. That's what's important...to me anyway. And that's pretty much all I have left to say about it. It is what it is...one gurl's opinion.
With regard to the actual topic at hand...
I don't want Hulk flapping his gums incessantly. A few choice phrases here and there would be fine. It works in the comics because it serves to fill out the story line because all you've got are some panels on a page and your imagination makes up most of the action. Film provides sounds and motion...you get to see all of what's going on rather than the most dynamic, cropped shot of that particular event. Besides, Hulk is supposed to be a font of rage and raw emotion. If you've got the time and presence of mind to make a wisecrack, then you really aren't in a rage IMO. But, hey, that's just me.