Ok, I'm not sure what movie the majority of reviewers online watched, but Kizmonogatari (Part 1) was AWFUL. Basically it was boobs bouncing, Araragi sweating/screaming/running, and a bunch of 3D backgrounds that didn't look right with the 2D animated characters. It honestly feels like the creators said "Ok, time to stretch 20 minutes of plot into 60 minutes. Let's make Araragi gasp and scream and flail for a 20 minute scene." They wasted so much time under the guise of suspense that when the "thing" actually happened, I was bored, not intrigued or excited. By the time the movie actually got interesting, it was over. Not to mention the inconsistent animation. The movement of the characters towards the beginning is really terrible (Hanekawa looks like she's hobbling across the street instead of walking), compared with a part towards the end I won't spoil that looked awesome and clearly had a different animator in charge.
I actually LIKE the Monogatari Series for the most part. It has its faults, but overall is a fun series that's different enough I keep coming back for the new seasons despite its flaws. So I'm coming from an honest place where I want to give it the benefit of the doubt and can't. Tekketsu-hen was unbelievably appalling as a movie and I personally think it shows how little they think of their fans. Do they think we'll like and rave about anything labeled "Monogatari?" Judging by the other reviews I'm reading online, that seems to be the case and it's really hard to comprehend. Whoever wrote the script left out 90% of the charm the show does have. The show wastes tons of time, but fills it with witty dialogue. Almost none in Tekketsu-hen. There were a couple laugh out loud moments, but that's it. I WANTED to see this movie, bought my tickets weeks in advance, and have really nothing good to say about it which is a huge disappointment.