If you've ever used Gunslinger in PvE, you'd know that simply wasn't true. Our super attack will usually take all three bullets to kill a single Major enemy. You seriously do more damage with a well-placed shot from a sniper rifle than you do with a super move. That generally kind of sucks.
But combustion is really effective for taking out groups of weaker enemies. As a gunslinger, I've taken out groups of up to five enemies using that perk.
neither the striker nor bladedancer are very practical in pve simply because you expose yourself its a risk reward and as far as im concerned bladedancer does plenty of damage, but here is a defense for it. it just inst instant results like stirker of the titan. instead of being an aoe it is a large damge that allows you to spread it out, do aoes with the wave perk just like stirker if you really want to, as well as chase down enemies (which you cant do with other classes), and go invisible.