I recently went back to pc gaming after a couple years of gaming mainly on consoles, and after going back, I have realized it is way better.
Here is why:
1. Better graphics/Performance
It is a well know fact that the vast majority of games look better on PC than on consoles; the best looking exclusives are on pc, the best looking multiplats are on pc. Many people say that it takes hundreds or thousands of dollars to get a pc that will have these graphics, but the truth is that a 60 dollar video card, maybe 30 dollars for 2gb of ram and a semi-modern desktop (any dual core basically), which you are most likely using right now or can be bought for 400 dollars, you can outperform any console. I have a desktop that I found in the garbage with a 3.0 GHz Pentium D, and 9600 gt that I found for 60 bucks on Newegg that can run Crysis on high at lower resolution. The laptop I bought for college will also run any game I throw at it without me paying anything extra to play games (it is high end because I run a lot of engineering/math/cad programs). Also, despite contrary belief it is just as easy to game on a big screen with a pc, I do it all of the time with my laptop, using a wireless mouse and keyboard.
2. More Games
PCs have many more games than consoles, not only because it is any easy platform to develop for so many armatures create their own games, but because the pc will always be backwards compatible. I can play almost any PC game ever made. PC's don't start a new cycle of games every 4-6 years like consoles do. (Consoles do have some backwards compatibility but it isn't perfect).
The PC can also play any game from almost any console, legally if you own the game for the console. It can play games from every console except the 360, PS3. And can play almost all games for every system except the xbox and ps2 (this should change very soon). It even upscale most games, including the Wii which actually looks better when the games are played on pc. This can all be done legally if you own the original game, and has been held up in many courts.
3. Better controls
The PC has way better controls than any single console. A keyboard and mouse, in my opinion are better for controlling almost all games. Even if you don't agree, you can hook up controllers from other consoles, or custom controllers such as wheels or joysticks. The 360 controller has support right out of the box, and hooking it to your pc is even promoted by Microsoft. You can hook up a dual shock 3 with usb or wirelessly with Bluetooth (a cheap adapter can be found for 10 dollars) and possibly . The wiimote also works with a pc via Bluetooth. You can buy or build an adapter for most older console controllers for less than 20 dollars.
Pc games are way more customizable than any console games. First of all, you can modify the control scheme of games so they are how you want them to do, try that on most console games. Mods also allow you to change aspects of the game, make a game look different, work better or have more content for free. You can also customize the performance of the game so it looks and runs the best it can on your machine, unlike consoles where you are stuck with performance issues.
Upgrading pc's is also very easy. This means that instead of buying a new machine in order to have the latest and greatest, you can get the latest and greatest by getting a new part for a fraction of the cost. You can chose what you want, and how much you want to spend, unlike most consoles. Plus, it is fun building and upgrading your PC.
5. Cheaper Gaming
The majority of the time, games on PC are 10 dollars cheaper when they game is released. (There are quite a few exceptions) They remain cheaper through the games lifecycle, and are often available for download at cheaper prices than they would be in the store. The accessories for pc are also cheaper than for consoles, and online is almost always free, unlike some other gaming systems ***cough***xbox360***cough***
I know that there are some reasons not to game on pc's: often more expensive to start out with, harder to get games customized just right, and the "need" for upgrade very once in a while... but all of those reasons are outweighed by the superiority of the pc as a gaming machine.
Please Read this before you reply, thanks