Gargoyle: Too often, players try to make their characters interesting by choosing an odd racial mix, instead of using the vast possibilities for personality traits that are present even in an all-human campaign.
TSK, TSK, TSK.
even in an fantasy game, there exists racism... (jk)
I don't see why players should be restricted to only the core races. Interestign mixes will make interesting games...
That said- I think that orc/ elf is an impossible combination because they are mortal enemies- and its not just a racial issue. Elves are magical beings- graceful and wise. orcs are barbarians- brutish and coarse.
Unless you accept that elves go through the rebelious stage, and a young teen elf likes an orc for his renegade ways- they will never get together...