I absolutely love engineer, but I've been so unimpressed by most of the utility skills -- if it replaces my entire main weapon line, it better impress me. None of them really did. To be fair, I didn't play with bomb kit, as I've seen enough people use it to know it's good. I used flamethrower, elixir gun, grenades (which I love in THEORY), and mine kit and they were all absurdly weak. And, of course, the turrets might as well not be there as they are now. So I'm really hyped to see the changes next BWE; gonna abandon my other characters and focus entirely on an engineer.
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