Thinking about whether I should get Assassins Creed for the PC or not.
Don't.
You shouldn't get it for any platform, it's overrated as f*ck.
Great concept, terrible execution. It looks beautiful but plays like ass. Terribly repetitive controls (fighting sequences become very boring very fast), missions that end up being the same thing over and over, and no real method of sneaking around and being all 'assassin-like' the way the game makes it look to be.
Each mission is basically: go gather some intel (using the same few techniques every time), get into the place where your target is, kill him after a bunch of stupid cutscenes, then either fight your way out (crappy controls) or hide in a bush until your "threat" meter goes down.
There isn't any true sneaking around aside from the early part of the game where you can scale some buildings which is neat, but that's where it ends. You'd think you can go from shadow to shadow and creep around a castle and hide up suspended by ledges n sh*t. But no. If you want that, get Splinter Cell.