i think its that a) euro force wasnt particularly good and b) all the new weapons in it can be had in the normal game i think.
i know i certainly use the extra weapons it had on the -=RuleZ=- server i play on. they arent ranked servers but all the unlocks are open to all players regardless of rank. so that 3 weapon sets for each unit class. i particularly like the sinper rifle ... not the standard one, not the M95, the LA961 or something? its quiet and painfully accurate