Well it depends what type of multiplayer you're wanting. With Everything or Nothing, its multiplayer strength is co-op, which has missions that are completely different than the single player missions. It does have a deathmatch also but its pretty weak. Also, remember that EON is a third person shooter instead of the first person perspective like the other two games. Between Agent Under Fire and Nightfire, I prefer AUF's multiplayer to that of Nightfire. Movement is quicker, levels, to me anyways, are just the right size since its only four players, and best of all, the Q-claw, which if you and anyone you face get good enough with, its like being Spiderman and having mid air battles. Nightfires multiplayer is nothing bad itself though, it does have bot capabilities even with four players playing (up to 6 extra bots if I remember right, each can be customized), big levels since it has bots, just no Q-claw in this one. As for Single player between the two, Nightfires shines much better than AUF. AUF's single player levels are shorter and easier than those of Nightfire. Well, hope this helps and if you can think of anything else you need to hear, feel free to ask. Oh yeah, good thing I preview my posts cause I forgot about Goldeneye, havent played that one yet, I just know about the others.