The Maverick assult rifle is pretty much the only AR I use any more. It has about the same ROF, recoil and damage as an LMG. I use it when I want a support fire weapon with a little more mobility and better handling than an LMG. I run it with extended mags and the shotgun attachment since its slow rate of fire can be a liability in close range.
The maverick sniper rifle is fun to screw around with. If you like the default scope or variable zoom it offers some advanages over the other rifles in it's class because it has a bigger viewing area and highlights targets. I would recomend avoiding chrome lined on it because it increases the recoil to the point where it is almost impossible to follow up a shot at range. If you want to run it with either the ACOG or Thermal sight I would give the weapon a miss. The VKS has the same one hit kill area without the chrome barrel, is silenenced and has 2 more rounds in the clip. It's a niche weapon, but certainly a viable one.