Yeah it is about 10EUR. I never played a Splinter Cell game. Do I have to play the previous ones to enjoy it. 
 
I hated MGS4 (which also was my first MGS - I had no clue what was going on.), but loved the more stealthy stuff in Assassins Creed.

It's probably more akin to Ass Creed than it is to MGS4...but it's not really like either.  Did you play Arkham Asylum?  Picture that, but with a less intriguing character and more gunplay as opposed to being strictly melee.  I don't think the story is anything special, overall, but it's enough to keep you going through the game.  It's certainly not a game you are going to play over and over again, but it's a pretty good game for what it is.  BTW, I think you'd almost probably enjoy it more if you haven't played the previous games.

Get it.  It's worth it.  
 
It's a stealth game, but not too hard core.  You can be spotted, then hide with no real problems.  I'm still playing it actually on the 360 and I love the tactical aspect of sneaking up on dudes and stabbing them in the face and neck.