Diablo 3

[Redcap]

The most annoying thing is when they'd wall you in then fire off an arcane sentry, or some other ridiculous cheat tactic.

Worst I've come across are invulnerable illusionists with one hit kills on my character (15k HP with 60% damage mitigation), it's absurd.

Arcane sentry/vampirism/molten (or plague, or desecrator) is the worst combo I've run across so far...invulnerable/shielding/illusionist are also annoying.