What I've noticed over the years are that when it comes to these types of games is that players are somewhat split into either Metro or Stalker games and usually folks who like one type don't like the other as much but that's not necessarily always true and there can be more to it than that when it comes to Exodus.
There has been, however, fairly significant changes from each Metro game to the next and Exodus was more drastically different than either of the first two. I'm mixed on some of those changes but I felt its DLC helped re-balance it since each added more underground content and story. I thought Sam's story was especially great and would love to see more content detailing him finally making it back home.
I can't remember which, either the 1st or 2nd game had some DLC with other characters but it's been so long that I don't even remember what that was. I really need to go back and check those out again.
