It takes the gameplay elements of the first two games and puts them on the same disc. A few minor gameplay fixes but no big changes. Only complaints were some of the vehicle levels just weren't that fun and the camera is frustrating at times. Easy to pick up and play though. Good game.
This idea is one of the best and funnest ones to come out for video games in a long while. The complete saga has the same style of play and same idea as The Complete trilogy with 3 new episodes and plenty of missions involved in them.
Basically play through the 1st 3 chapters of the story in the story mode and then replay in the free mode to explore all or most of the hidden areas.
Unfortunately to open all the hidden areas in the first 3 you have to eventually play the last 3 which are the exact same episodes in the Trilogy version game. Considering you had to play the levels multiple times to beat that version playing these same levels multiple times again did not seem like much fun to me.
The xbox live enabled activity to the game is really a waste because the couple times i tried to find a game online it could not find one because the community is so small that it virtually is non-existent.
Achievements are spread throughout all levels so again if you don't want to play the old ones again they will not be achievable. And some are achieved only by playing the same level multiple times but with different characters. Ex..Destroy the emperor with Dooku 10 pts. Destroy the emperor with Kit Fisto 1o pts. Destroy the emperor with Darth Maul 10 pts.
I found this quite annoying.
All in all if you just want fun and time with the kids great, but if you want new content and not so much repetitiveness you might want to pass.