Call of Duty, Medal of Honour, World of Tanks (upcoming MMO) . . . There's quite a few, a lot never got famous, however. There are lots of sniping games based on WWII scenarios, but sniping games are known for being really, really bad.
i'd say any call of duty game before modern warfare and try the first call of duty first ^.^ don't just go with the 4th or WAW cause it has pretty graphics