It isn't that big of a deal *to you*. It's a straight up deal-breaker for *me*. Berserker is the type of barbarian I'm most interested in, but I wouldn't play one out of the book. And after all the discussions about the problems with it, both concerning balance with other subclasses, and functional thematic disconnect, WotC prints the Zealot, which essentially tells us the subclass is balanced without the exhaustion (or Zealot is way overpowered). These subclasses are no where near on par.
If your game had both a Berserker and a Zealot, maybe your group would feel different.
Any issue that comes up again, and again, and again, from different people, is by definition a real issue. I've decided to quit downplaying such issues for others just because they don't impact my game.
Not trying to attack your post specifically, I've just decided I'm going to stop delegitimizing other people's issues.