I tend to agree that the Specialist is pretty weak.
I really think their HP is too low.
I really want their 4th sniper rifle because I want to be able to take out aircraft and that is literally the only tool infantry have for that since the heavy's ion shot is garbage, but the grind of 500 kills with the lesser rifles doesn't sound appealing at all. For right now I'm holding off hoping they eventually realize that ion shot is garbage and make it better.
I don't really want to go back to everyone playing specialist and destroying everyone at close range with the sniping class, but I don't feel like their long range potency is that much better than the other classes, while they are noticeably more fragile.
Personally, I would like to see either the radar scramble or the radar improvement go away on the infiltrator skill but have them gain 50 hp to match officers and assault. Also, if they could stop yelling "ENGAGING STEALTH MODE!!!!!" that would probably be a good change.