The wired side of the wrt3200acm is supposed to be top notch, up to 1 GBit/s linespeed (SQM is another matter, as I don't own the device in question nor a 1 GBit/s WAN connection, I can't provide any estimates about that, but it's still supposed to be rather good). Its wireless capabilities are also good on paper, but the driver/ firmware not being maintained anymore (which doesn't imply that it suddenly ceased functioning, but the known defects (of which there are plenty rather obvious ones) don't have any prospect of getting fixed).
So if you have a wrt3200acm, it should work pretty well as a wired router. But if you haven't bought one yet, it feels rather hard to justify the expense considering the state of its wireless side in comparison to x86_64, the RPi4 or maybe even the nanopi r2s (or other mvebu devices without wireless hardware (e.g. solidrun clearfog) or e.g. the Turris Omnia); respectively betting on the future with ipq807x (not supported by OpenWrt yet, but it's not looking too bad for the intermediate future). What to pick depends a lot on your requirements (WAN speed, expected services to run in addition to plain routing, existing wireless infrastructure) and your budget/ rough location (prices and availability differ a lot between North America, Europe and Down Under).
 at this point, it's indeed a gamble how support for ipq807x devices will pan out exactly - or when to expect reasonable support in master, if you'd go this route, you need to be prepared to take the long way round and accept the potential for failure.