Stealth levels in games that are not built around stealth. The only games to get it right are based around stealth, like the Splinter Cell and Metal Gear games. Even great games like Wind Waker and GTA SA have had their fun temporarily ruined by half-ass stealth missions. After the success of MGS I wasn't surprised to find it in other games, but it's been six years, and bad stealth is still showing it's half-assed face.