That entirely depends what you want to get out of it.
If you're focused strictly on "becoming successful" and getting a bunch of views and subs then there are pros and cons to gaming channels. On the plus side, it's possibly one of the biggest single subjects on YouTube right now getting millions upon millions of views, and there are always new games being released that you can try and use to freshen up your content.
On the negative side, most of those views are being taken by the big, already established channels meaning it is definitely harder to get noticed. But that's true of any subject these days.
Really you should be making content that you have fun making. Don't set up a gaming channel just because it might get popular. Do it because you have fun making gaming videos.