BSN forum is usually pretty terrible. I really don't get the whining for Dragoons at all. I don't think the Collectors are all that bad either, yes they are a bit hard but it's usually pretty fun since I'm at least not getting stun locked to hell and back.
There's nothing wrong with any of them, at least, nothing blatantly wrong. Issues will become evident later on when people work out how to exploit them, and where imbalances may lie. As it is though these wankers simply cannot handle something new being added to the formula. They cannot adapt, and instead accuse the game of imbalance.
Collectors pack a mean punch and take a solid beating, but they've clearly got their own play style going on. They're not like the Geth, which seem relentlessly unstoppable in any situation. You can work around the Collectors by picking your priorities and sticking together as a team. They offer
a new style to play, which is exactly what a new enemy should be all about. People
should have a somewhat rough time with them, in order to learn how to fight them more effectively. Nerfing the Collector's damage/health would be so boring, simply dragging them back to equalisation with another faction.
And yeah, there's really no issue with the Dragoon at all. It's a tough, pure armour rush unit. With the right gun, and the right armour eating powers, they're nothing. They're just another, unique unit to watch out for that gives the excellent Cerberus faction a new twist. I really love the Cerberus combination of units. They've got excellent variety that really keeps you on your toes. Great balance of middling grunts, rush units, and slower, heavy stuff.
I'd probably care less if this wasn't BioWare's own forum. I just hope they're not stupid enough to listen to the whining.
I'd rather stick with the Turian Infiltrator.