If you like the characters and have seen the prequel films and enjoyed them, you will definitely enjoy this. It has great special effects, it's action packed, and it's fun. Very enjoyable for me, but I watched it in the cinema, and films like these are always more fun in theatres.
So I'd say rent. Great fun while it lasted, but not a classic, and not something I'd watch over and over.
Edit: A note though, don't watch it expecting Schindlers List 2. There is next to no story, and it's not trying to be artistic or thought provoking. It's a throwaway weekend action flick you can sit back and pop open a few beers to.
