While Assassin's Creed is a sandbox-style game, it doesn't possess the depth of environment of something like Stalker or GTA. Instead, it focuses primarily on its main mission structure. So while the game does deliver marvelously detailed cities and landscapes to explore, there isn't all that much to do aside from pure exploration and a few types of collectible missions. What you're left with is a repetitive side quest requirement for completing each mission, though the issue is alleviated somewhat with the PC version's new side-quests. It's not enough for someone who played the game on consoles already, but for somebody totally unfamiliar with the game, it's certainly worth playing. Even if the game does falter in spots, it still offers a unique mix of action and exploration that deserves to be experienced.