I haven't really compared, but it in pve for me it seems easier to take down mobs solo with a commando on lower levels than it was when I was leveling up my main which is a gunslinger. I haven't leveled up a commando fully so I can't compare yet at 50. And by easier I mean less worrying about cd & ammo like I do with cd & energy with the gunslinger (at least for me). Of course it could be that by the time I got around to making a commando alt I was just more used to the game.
I'm sure that doesn't have anything to do with Mortar Volley, of course.