I've been running MMOs on wireless from an Asus RT-AC56U for the past few months w/o hiccups; currently have it loaded with Merlin's AsusWRT build and it runs great across the house (may be 150' range), mind you there's very little signal clutter here.
I wish I could run wired, but my present situation doesn't allow it even though it isn't really necessary since there's been no issue since configuring the router and wireless adapters (which was fairly simple). One thing to keep in mind is that AsusWRT and Merlin's version of it are very simple interfaces; it does have a lot of options, but the customizability may not be as deep as you may want if you really get into it (at that point there are other firmwares that may interest you).