Current Ryzen CPUs are slightly slower at gaming, but not significantly. The next generation (4000 series) which is around the corner, is supposedly going to be 20% faster, i.e. smoking Intel. That information is based on leaks, so, take it with a grain of salt.
First generation Ryzen had some hiccups. I'm still rocking my 1st gen Ryzen. But current Ryzen systems have matured quite a bit. I have not had any major issues with Ryzen, apart from being unable to clock the RAM at the speed I wanted to. But that issue is unique to the 1000 series of Ryzen.
If you decide to go this route, go with either a B550 or X570 motherboard. You can put a cheap 3000 series CPU as a placeholder if you wish. The 4000 is guaranteed to be compatible.