Corsair is just fine, you just need to figure out how to play it.
It's extremely fast, and you can one shot anyone if you catch them.
Regarding PvE, I dunno abt everyone else but I'm prefectly fine making silver grinding.
Also next patch or two looks like power up as well.
I think if you are good at playing rat classes corsair will work for you.
The devs still haven't figured out that the otters should render in the "other people's effects" catagory and not on everyone elses computer. When the buffs go into place I'll be quitting to stop my GPU from melting down because of the DEVS being lazy and retarded.