That's right, monsters that aren't high-level outsiders exist too.
The dire rhinoceros is predictably not that good. 17 animal HD and a nonhumanoid, handless shape aren't very useful, especially with no special abilities other than a very crit-happy horn (17-20 range, 3x damage) and Trample. Constitution and Strength in the 29-30 range are neat, but don't redeem this.
-0 LA and happy new year to y'all!