Specifically, the duration. They last far too long, and can lock down an entire lane for the duration of a whole zone capture.
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They are rather small, require malee charge and have a decent cooldown given their benefit. I really think they are underwhelming when other charges are shoulder checks, concencration, tempest strike, etc. I play alot of crucible and they really never are a problem in terms of abilities, even when in a control zone they don't cover the entire thing they are VERY easy to just step back from and ignore.