Yeah I don't know why everyone drafts your fetchlands so highly, but assuming your group doesn't gear is okay. But it kinda just becomes bonesplitter, so...
What I can't figure out is why people don't take fetchlands more highly in everyone's cubes. I don't think they're overrated or underrated here - just, well, rated. But they seem undervalued in other people's environments. Don't players want consistent manabases so they can cast their spells?
I think this phenomenon was brought to bear in the online drafts Jason ran, where every participant was a Riptide regular. We know they're good, and sure enough, there weren't enough to go around.