Yes yes i would have to agree with 'tbaher' 100%! Serious Sam 1 & 2 are excellent funny games to play with each other. Plenty of action and lots of secrets to be found. And they multiplay very well. Good choice tbaher.
P.S: Ive never actually played Diabla or Sacred but are they similiar to Serious Sams style of play? If so I will have to purchase them or aleast download a Demo!