This was a decent interactive comic, and a lot of its success or failure was going to come down to the ending. TTG simply blew it, there. Lee's fate is as a walker, chained to a radiator until his wrist rots off, haunting Clem's dreams until the day she dies.
The ending was a hopeless bungle. Lee's great sacrifice is no sacrifice at all. First, it's unimaginable that Clem, if she even survives the city (and recall that Lee forgot to, you know, actually tell her how to find Omid and Christa--oops!), won't be forever haunted by the image of zombie Lee chained to a radiator in a windowless room for all eternity. The big deal he makes, that she shouldn't shoot him, is horribly, horribly misguided. Putting down someone before they turn is extremely cathartic. It was a point of honor and pride and closure for Carl to put down Lori in the tv series. In the game it completely spoils the whole ending. Clem doesn't get that closure.