Jack of all trades isn't a bad thing per say. I've had many jobs (including my current one) where they were specifically looking for someone with a wide skill set - usually smaller companies.

Depends on the specific job your applying to. Some companies want specifically an iOS developer or only front-end websites. Others would love to hire 1 or 2 that can handle multiple languages, server setup and config, basic office setup (desktop pc's, printers)... So long as the job pay appropriately, a little server work breaks up the day to day programming grind.