I think it's just so refreshing to have 3 golf games as oppose to the one. We have 3 brand new games. It will be one year for TGC come Augusta, PG is in the works on consoles and is going on PC, and EA's got a totally different golf game with the name change, new gen consoles, etc so I think it's a great time to be a golf gamer.
Both TGC and PG have course designers (PG's Course Forge is only on PC I think) and RM PGA Tour looks to have a nice blend of courses to go along with the PGA Tour license.
And these games are all different. If you want to play some great courses designed by talented users as well as some wacky and fun ones, then you can play TGC. PG has capabilities of letting users completely recreate real world courses to play and RM PGA Tour features the career mode and PGA Tour tracks that virtual golfers love.