MANPADS are still (In the real world) notoriously cumbersome, unreliable and easier to deal with (by a target aircrew) than most SAM's. As some one mentioned here that an Igla should be persuaded not to bag you simply by dumping a flare or two combined with an evasion manoeuvre. The Igla, amongst others, are waaay over powered, not so much in explosive (killing) power but in flight and reliability.
A personal example of this is during one home made multiplayer mission my Flight members (who has already been bagged by a Strela) both watched in amazement as one Igla armed infantry man lobbed missile after missile at me as I went over his head at 270 kts and 50ft on the clock. Most hit me of course, a couple I managed to evade. In all they counted 6 missiles launched by the time I was myself bagged.
The reload times are way off and the ability to get a lock on an aircraft overhead at 50ft and even at a relatively slow speed is pure fantasy. I hope ED can work a little on the AAA in DCS, also I would love to see some of the higher calibre AAA with the traditional white puffs of 37mm and black for the heavier guns.