I suppose it all depends on how you interpret TOS and the 2009 movie. I see them as vastly different franchises, with only some superficial conceptual commonalities.
There have been people who felt the same way about TMP, TWOK, or the later movies vis-a-vis TOS, about TNG vis-a-vis TOS, and about DS9, VGR, and/or ENT vis-a-vis the earlier series. Heck, back in the day, there were probably people who felt that about TOS's third season vis-a-vis the first two. I think there have been one or two people on this very BBS who consider TOS and TMP to be the entirety of Trek canon and discount anything after it. And do people still remember who James Dixon was?
Star Trek is a lot of different creations by a lot of different people, and they engage in the pretense of sharing a common reality, yet not every viewer is willing to play along with that pretense.
But the intent behind the movie is that it's a timeline that branched off from the main one in 2233 and all the differences (aside from those that can be chalked up to different creative interpretations) are a consequence of that alteration.
More importantly, though Shatner's portrayal of Kirk seems to be a very different man in a very different kind of story than Pine's "NuKirk" in the 2009 movie.
I don't think anyone disputes that. The movie makes it very clear that this Kirk has had a profoundly different life from Kirk Prime because he never knew his father. Most of the other characters are basically the same people they were in the original history (except Chekov is inexplicably older and Uhura has a more fleshed-out personality), but the fact that this Kirk is very different from his counterpart is a core element of the story. He grew up as a directionless delinquent, but Pike saw his potential and pointed him in the right direction, and then Spock Prime let him see who he had been in another reality, which let him begin working toward becoming that same great leader despite his very different beginnings.
Basically the filmmakers' idea was that Nero had thrown history off-course, and the events of the film were about getting the universe back on track, to an extent. So it starts out with Kirk very, very far from his "first, best destiny" and tells the story of how he gets back on the right course.
It's a safe bet that TOS had a major action-adventure component to be sure, but it was basically an adult drama. The 2009 movie is much more comical than TOS ever dreamed of being.
Oh, yeah, that "Trouble With Tribbles" episode -- so tragic, all that famine and plague. And "A Piece of the Action," that dark, disturbing journey through the heart of mob brutality... the stuff of nightmares. *shiver*
And isn't it strange how the movie numbering jumped right from III to VI without anything in between...?