First, Makoto001, I agree with you. The lash is just one piece of wargear, and there's not a single model in the game that is cheesy by itself. However, the moment you bring out your lash prince, eyes start rolling, regardless of the rest of your army list. The lash gained it's notorious reputation, because opponent's don't like losing control of their models. However, there's sufficient counter powers out there, although they aren't available to every army.
On the other hand, while the lash is only a mid-ranged power, at the same time, nearly every lash is wielded by a model with a 12" movement (speaking from the chaos codex). In essence, a well positioned lash user in the center of the table can pretty much reach any infantry he likes by the end of round 2. Most player's don't know how to deal with that kind of scope.
I've had players complain about my use of a single lash prince. I always inform them that the lash itself is not cheesy, and then politely repeat, "The lash is just one piece of wargear, and there's not a single model in the game that is cheesy by itself."
That said, dual lashes tends to be, if not a pungent two year old bleu cheese, then in the very least, a bastardized American cheddar. But I'll let someone else give their two pennies on this part.
EDIT: I'm constantly up against a Space Wolf player who drops dual dreads in drop pods behind my lines, outfitted with melta guns. I can't tell you how often I lose two predators on the first round to them; and yet, that's not cheese? Cheese is relative, cheese is subjective, cheese should not be spoken in regards to the tabletop, unless it comes on a hamburger with a side of fries.