I've only recently got a console (xbox last week) after playing games on the PC solely for the last 15 years (ouch!).
What I found with the console is that I can plonk myself on a nice comfy sofa, put my feet up, switch it on and get playing straight away. I've also got a big TV to view the games on (better than my 19" monitor at least – and no, it's a pain to hook that up to the PC!).
I don't have faff about with any other issues (shutting down crappy software that starts up when the PC boots up, checking firewalls will let the game play).
On the xbox at least, the servers also seem quite reliable. I don't have to spend time finding servers with good pings and people in them.
Also, a load of people in the office seem to have consoles (well they all have xbox), so I can link up with them.
The downsides are that I really suck playing FPS with controllers, but this will just take some practice, I also can't use a steering wheel that I brought a while back for driving games.