They can be pretty annoying when you're starting out. Loud, makes the screen shake and that tail swipe does a lot of damage.
I hate the height of the bushes, especially on the lake shores (starter-ish areas). They envelop your character, can't count the number of times I aggro'd random stegos, trikes or ankys. Or lost early wooden huts to bronto accidents ><
Luckily once you get some carnivores of your own, you'll be glad there's so many brontos. Nice amount of meat repeatedly delivered to your doorstep ^^