1: Consoles have the superior games: Basically all major AAA titles are designed for consoles now, and some don't even go to the PC at all. While the PC does still get quite a few good exclusive AAA games, consoles get the lion's share, making investing in them a better value oriented approach.
2: PC performance superiority over consoles is waning. Unless you really shell out for parts, most gaming PCs do not have significant graphics/performance advantage over current consoles, and they certainly won't over the next gen of consoles.
3: The controller is an infinitely better control setup for gaming over the mouse and keyboard, with the exception of RTS, MMO and certain select games. While the mouse still controls better for precise aiming, the joystick serves that purpose just fine and has the advantage of being infinitely better for movement controls than the keyboard.
4: The more you plan to play multiplayer, the more appealing the consoles become. PCs basically have ZERO in-house playability, and only increase and spread costs of PC gaming to multiple people, while with 1 console 4 people can play multiplayer together; it only takes 4 consoles for 16 to play together. With few exceptions, the console community also tends to stick a bit more with games too; its easier to find matches for console games for longer than it is on PC, unless you REALLY, REALLY like playing a particular way.
5: Portability. Consoles are easy to transport, work basically anywhere there is a TV and power, and don't take up as much room. Good gaming PCs are often HUGE, and often way A FUCKING TON, in addition to having multiple parts that must be transported.
6: Player-generated content is one of the few advantages PCs really have, and its not even that great an advantage. Because when you think about it honestly, 97% of all user content is shit or smut, 2% is decent and only really 1% is truly good worth saying "Yeah, this was worth it".
7: What sounds more appealing, in all seriousness?
Pay $300-$500 for a system that is guaranteed to play any game that comes out for it for the next 5 years, is easily portable, has an extremely simple set-up and plays games at very good level of performance, OR pay anywhere from $1000 to $2500 for a system that may only be relevant for 3 years before needing new parts to play the latest games, isn't portable or sharable, can have an extremely complicated set-up, but can play games at a higher level of performance.