Out of curiosity, why do you feel void elf monks make both worse? The monks on Pandaria were adept at battling sha influence, so it stands to reason that their training would be effective in helping the void elves resist the energy now struggling to overcome their bodies. I get night elf mages given the cultural ban on magic, and orc warlocks undermine the end of the WC3 original orc campaign, but personally I thought the void elf monk was fairly fitting (certainly the most of the three tank/healer/dps classes, though I guess that would balance against the goblins if they lacked any of them).
Regarding everything equating to nothing, have blood elves, trolls (x2), and dwarves (x2) suffered for their wide class selection? None of them made your post, and they're the five races who can be the most classes. While I do think the dwarves in particular suffer from being a joke race (only really brought out when brew's involved or for a Nesingwary gag), that has almost nothing to do with their classes.