The primates are quite powerful, but I don't see them much.
I do use the Darkmoon Monkey from time to time, since 273 speed will get slightly more use out of Clobber. But with 325 Power the Baby Ape can really dish out some huge damage. Smash, while a bit risky since it is only 85% hit, hits really hard and just wait until the beast racial kicks in.
With 260 speed clobber will find slightly less use against speedier opponents, but why not try out Roar. 25% damage buff with already high damage abilities is great.
Banana Barrage is a bit random, sometimes you will miss alot but those times when all bananas hit it is lovely. And the "dot" part actually does really good damage as well.
You should have no problem using it against Mechanical Pandaren Dragonlings since they don't have mechanical damage, you are probably worse off against the Zeppeline since it is both faster than you and has strong damage. Don't worry too much about dodgers, you will punish them after they have done their dance.