Skill. It's annoying as heck.
lern 2 airsh0t scrub.Market gardener, hands down. I find it difficult to track an enemy that is above me, so that makes it difficult to kill said enemy. Most other irritations can be countered (which is why I like this game), so simply changing class works. I could change to scout to outrun the market gardener, but ultimately I want to kill the market gardener so that's not really completely effective...
Ditto on what darksoul said... Everything should have a counter, and there's just no counter to the flippin' thing.
the dead ringer
The dead ringer is an abhorrent tumor on the side of TF2 and should be removed with all haste.
IT'S A VIABLE STRATEGYYou mean you don't like it when people have 1000+ hours as spy using nothing but dead ringer/spycicle combo and tell everyone how pro they are? :biggrin:

IT'S A VIABLE STRATEGY
Dr. Enforcicle is the best class in the game.
A Rocket Launcher in the hands of a new player is nowhere near as effective as it is wielded by a pro. Same thing goes with the Tide Turner. If it is really OP then new players using it would have a much easier time getting kills- which is not the case.