You're kinda right. His power more so comes from when someone else is in major peril, where as a berserker is more of a "I really need this thing dead" he's more "I really don't need this person dead" and he exerts himself as a human shield essentially. It's why he has a kite shield, a Knight so to speak.
RWBY could and should be so ******* good but it just kind of isn't... I keep watching in case it finally reaches its potential but I'm starting to lose hope
Writing is very meh as well as the voice acting dialogue. Animation quality is getting better but is still pretty bad. The fighting scenes are amazing and I also like it because of the fact that it proves that 3d animation can be done on a budget and not suck absolute dick. I really hope more studios will be inspired to make 3d series because of RWBY.
Unfortunately with Monty Oum dead I don't know if the fighting scenes will maintain their quality.