Because they were. 1 was overdone, of course, but it was supposed to be. 5-9 weren't that great at all but they at least they weren't overdone and are sort of guilty pleasures for me. 10, though, had this overdone song about Littlefoot going adventuring in the beginning---wow! that's sooooo exiting! Cause, like, in movies 1-9 he never once went adventuring, so this is soooo new and exiting! Also, some of the visuals in the song felt like they were trying to reclaim the success of the classic originalm version of "Big water". Hah, nice try. It's just crappy if it's trying to repeat a cool moment of an earlier film.
By the ways, did anyone but me find Cera's nightmare...like, the scariest part of the whole movie? The extreme brightness of it, the huge crowd, the loud noise, it's just unnerving!! Where in the world did Universal get the idea that it would be okay to put that into an LBT film? Oh, and Topps in the dream---did they really have to make his speaking part (and basically role) of the film? So much for an average film role for Topps!
It had a huge, overdone sad part at the end, and then this dramatic shot all every longneck in the world almost leaving this giant crater. As a resuly individual moments were all but lost for 10 and the movie just stood out as some huge picture. I don't consider "Bestest Friends" and the whole end tearjerking as much as...overkill! Littlefoot never had a father in 1-9---what was wrong with that? Why do you have to go ahead and DESTROY the image fans had had in their mind for years and years and movies and movies?
LBT 11: Oh god. This film was the overkill of the century. All the adults had this huge song at the beginning that was no doubt trying to seem like the awesome songs of the earlier films. Then during "Girls and Dads" we got a shot of Cera and Lizzie walking side by side that completely ripped off a moment of Cera and Ducky during "The Mad song"---which I do like, and don't think should be copied in any way! We even got a lame "angry mob" moment, and after that, towards the very, very end of this crappy film, they had to give most of the main cast a scene where they bawl and bawl and bawl their skulls out. Yeah, cause we've never seen LBT characters cry before that moment and really needed the climax of the film to have everyone burst into tears. Even spike did it---which shocked me, since I never would have expected him to cry over spilled milk! And usually crying scenes are very emotionall...this one was ridiculous!! And then, to cheer us up after the crying par-tay, they gave us a sharptooth encounter that was by far the worst ever done, and it ended with every single member of the great valley gathering around the tree and partying and there's all this CGI and it didn't feel happy at all, it felt overwhelming!! (Even 10 was less overwhelming and publicised since the ednign didn't do an overwhelming gathering of every dinosaur in the valley!!)

Even the scene where they're all playing with the tinysaurs in the underground cave was overdone! The only thing that saved this movie from falling into complete darkness was the romance storyline between Topps and Tria. A romance storyline---something that you'd think would be restricted from LBT---saved the day. (P.S., I don't know too much about Threehorns...b ut Topps has good taste.) But like I said, individual moments were practiacally lost---the whole thing stood out. Even the Tria storyline, which could have been it's own thing, had to be part of the film's main plot.
LBT 12: Though not as overdone as the last one, it had a huge overdone birth and the 2nd half was resorted to the "big day!" which was sooooo overdone, with all the singing and huge groups and stuff, and the big "night before christmas adventure!" The last moment action sene where Tricia falls into the water also felt like a bit of a ripoff of the last moment action scene where Spike fell into the frozen pond in 8. Both times, we thought the movie was over, only for something to happen, a character to almost drown, another character to save him/ her, and then everyone all smiles. Geez!
While 2-4 were the only real gems we got from LBT, 5-9 weren't too bad cause they wren't overdone. But 10-12...were overkill. Exposure. Suicide. Need I say anymore?