Rinu: As others have said, it depends on what you plan to do on your pc/notebook.
In general, if you spend a majority of your free time playing the latest high-end games, having only Linux distribution on your machine isn't a good option.
Owners of proprietary drivers (NVIDIA/ATI) are getting better at supporting their Linux versions. However it is still not one of primary platforms games and more complex applications are developed for and it shows.
If you are Photoshop user, there is no solid Linux equivalent (speaking from personal experience).
Frankly, the only thing keeping me away from using Linux full time is gaming. The system has many awesome features, is very comfortable to use and basically any common application is multiplaform today, so you don't have to get used to a new application.
You can always use dual boot (having Linux distribution and Windows installed on one PC) and use one for generic use and other for gaming.
Or you can try Live CD. All distribution I know has option to insert installation media into PC and choose live version (it doesn't install or rewrite anything) just to see how much you like it.
Alright, thank you.