Savage: The Battle for Newerth (XR) and Natural Selection do this RTS/FPS blend best. What keeps people playing are good game mechanics, while both games are almost free from RPG elements - which is a big plus IMO.
Savage: http://www.youtube.com/HurlyBurly3027
NS: http://www.youtube.com/BlindNS
Savage: http://www.youtube.com/HurlyBurly3027
NS: http://www.youtube.com/BlindNS
http://www.youtube.com/watch?v=qvZJqZiZ_asWorgen said:look up a game called savage 2, its a mix of fps with 3rd person and rts and it works pretty well all around and its free