Just a little rant of mine...

Positive Factors

I. Custom Control Mapping
Left-handed , right-handed , when your playing on PC , matters like this hardly matters.
If you don't like the controls , you can map it anyway you want - for most games.
Ease of controls , that's what make PC gaming flow.

II. Mods
Modification of game data is the easiest on the PC. It's certainly possible on the PSP , Xbox360 , the PS series and various other consoles , but a modder's favourite is still the PC.
Mods can be pretty important in bolstering the fun factor of a game as well , for one thing , Oblivion would've bored my pants out ifnot for the mods available out there.

III. More In-Depth Multiplayer content
Sure , the PS3 , Wii and Xbox360 features online play , but the PC is still a personal favourite.
For one , you can chat with ease in the game and chatting amongst a sea of crossfire is what makes a multiplayer game a multiplayer game.

IV. The starting grounds for Indie Games
PC is the homeground for potential indie games and I must say , some of them are actually pretty good.
Certainly , most of them are old-school , but there are some 3D ones and their not even half-bad.
What's more , indie and doujin games comes at a cheaper price compared to official games , so if your looking for something more simplistic for a change , there's always and alternative.

V. Visual Novels
Eh , this is something more personal but most Visual Novels start off on the PC.

Drawbacks of PC Gaming

I. Expensive to Maintain
A computer is expensive to maintain , to be specific , a gaming computer.
You need to make sure it's up to date , the graphics card is good , the processor is good and sometimes , the network adaptor have to be godly as well.

II. Some awesome games aren't on PC
Like Metal Gear Solid , Persona and the Tales series.
Some games just don't make it to the PC.

III. More easily subjected to "cheating"
Games like , for example , Crysis Ihad some pretty bad Multiplayer experience solely caused by "hackers" who made use of the loop in the game data to cause some serious disruption in the online experience.
Still , I guess I'm grateful for the booting system.

IV. Can't enjoy a "full experience"
If your PC's specs is average , or below average , you'd have a very tough time in playing high-spec games like Grand Theft Auto.
Turning everything to low ain't gonna make a game pretty either.