re: Assassin's Creed: Which One Should I Play?

II and Brotherhood are basically one long story. Brotherhood picks up literally the second after II ends. Revelations is the final part of this story, but takes place in a different place and later in the character's life.

The story from II and Brotherhood is the best story I've ever played in a game. Ezio is the best character in any video game series for me.

My recommendation is read up on what happened in I through some wiki page. Interesting game when it came out but way too tedious now.

Play II and Brotherhood. If you really like the story then I would recommend Revelations. It's a pretty good game still. The story isn't up to par with the previous two but the gameplay is a little tighter. There were some frustrating mission types (fort defense).

III wasn't very good. I played through the Ezio storyline multiple times (at least 6 times each). For III, I played it once and was done.

IV was pure awesomeness. The story isn't the strongest, but the location and gameplay is great. Easily the most fun game of the series.