Anyhow, teleportation is often considered something mages can do in fantasy stories. I'm not sure about the "frankenstein monsters" thing... what creatures are you referring to?
Sorry, I was thinking about a Goblin teleportation device run by goblins named Spork and Scooty, not arcane teleportation which requires everyone to hold hands and kiss the magical portal.
Skeleton "pits" are usually graveyards are areas where many died in a long ago battle, so it's not unusual for a fantasy game to have them.
But skeletons playing air guitar and dancing around in a mosh pit? This also wasn't around a "graveyard" persay, though I'm sure many had died there.
And the goblin racing track... keep in mind that Warcraft treats goblins the way most fantasy treats gnomes... as tinkerers who tend to break things they tinker with (BOOM!). So, racing with what you tinkered with isn't really that unusual, either. I don't really see those as being unusual for the world.
Heck, if Tatooine can have Pod Racers, I don't see why the Shimmering Flats can't have them too. I wouldn't be surprised if those Goblins/Gnomes "tinker" themselves a starship and introduce themselves to the Protoss. Speaking of which, I also seem to remember a certain goblin hat which carried satellite reception... don't be surprised when you can get glowing retractable swords either.
I really think the world in WoW is very well done and doesn't throw in anything that would seem that out of place.
Except for every second thing. But I don't mind. Starcraft and Lost Vikings and Diablo did it too... and people love Blizzard because of it. It's not unlike the "modern" reference stuff that appears in those Monkey Island games (though there's nothing to indicate that Monkey Island doesn't take place in the present either)