Hey, some people like cheese pizza! Don't act all high and mighty because other people prefer it! #CheckYourToppingPrivilege
In all seriousness, I haven't seen this film or the first one, because anything with Michael Bay's name attached to it scares me away. I know some people will accuse me of "being too blinded by nostalgia" to give those movies a chance, but I'm guessing those same people are not Transformers fans. Besides, to those people, I can easily say I enjoy the 2012 cartoon series, so they can eat their own argument with a side of crow.
Yes, I liked the original cartoon growing up and the original first two live-action movies (the third one was complete shit). I still argue that those two films hold up today (the second less so than the first, though). I haven't gone back and rewatched the original cartoon in a long time, but I'm guessing it won't hold up as well.
EDIT: Also, I actually thought the CGI TMNT movie was okay.