The 5.56 MVP I got my hands on was crap. Mags would drop out the fit was so sloppy, the fixed sites are cheap aluminum, the flash hider was not indexed, the bolt is not trued to the receiver and would bind. The safety would also fail to seat fully into the "safe" position.
It would not feed, period. Rounds would not seat on the bolt face even if that little flap thingy on the bottom of the bolt managed to pick up the round, resulting in crushing the case when the bullet jammed into the top of the barrel ring.
All in all, I replaced the magwell with the aftermarket Tromix, threw away the factory magazine, ( feed lips so sharp I cut myself) buffed the bolt to remove that crap finish, lapped the receiver, cleaned up the safety parts with a buffing wheel, replaced the flashhider with a linear comp and replaced the magazine catch spring. Now it feeds about %90 of the time if you don't tilt the rifle too much.
After all that work and mounting a 2x7 scope, it's a rifle that will group 5" at a hundred yards off a rest. I can make somebody a hell of a deal if anyone wants the damn thing.
Go for the Ruger.