The Witcher 1 is definitely a good game, and one of the better WRPGs released this gen. However, it's sort of dated in some aspects, and has a 'rhythm based' combat system, which focuses on you timing your clicks instead of being hack n' slashy. If you go into it knowing that it's a little dated you should enjoy it. It has a good story and good characters.The first witcher is on sale for $2.49. Is it a good game? Is it recommended to be played before the Witcher 2?
Playing the Witcher 1 before #2 is not required, the stories are mostly separate. However the first game is a good introduction to the world and some of the main characters, and the end of that game sets up the premise of the sequel.
A lot of people will say #2 is a lot better than #1, but in my opinion they're both good games with their own strengths and weaknesses. Witcher 2 definitely has better graphics and is more modernized though, while the first game is a little more old school.