Sequels can be exciting. A chance to see how the story continues, what happens next, all that stuff. The sequels aren't really that bad. Sure I prefer the first movie, but the sequels have their merits, too.
For example, we don't learn that much about the world of LBT in the first movie. Yes we learn there's a vast desert the dinosaurs are trying to cross to reach the Great Valley. We learne of a few locations. But we don't see much interactions of the adults nor do we get to really explore too much of areas outside the valley other than what Littlefoot and the others travel through. Come the sequels, however, and, throughout them, not only do we get a bigger picture of the world around them, learn some bits of how the adults got to the valley, but we also learn of more areas in the valley itself.
Sure you could say that these locations are non-canon if you're one of those people that doesn't like to include the sequels as canon. But in the end, you can't argue that the sequels have more detail about the valley and about the world around them than the original does.