I will sell ya one too if you want
bad is relative. In my 350z, I didnt really notice the unequal arm length except when I put the stock springs in the back with 15" wheels and drag slicks. The traction combined with soft spring rate gave the suspension a ton of travel, so I could really feel the effects on compression toe making the car veer left under throttle then right when I let off (probably due to my right counter-steering). It was bad enough that it took me a few practice runs counter-steering to keep the car in my lane.
That said, my 350z may have been an extreme example of what can happen. That car, having never been in any accident or anything, was not a very true chassis. The passenger side wheel/tire sticks out from the fender more as if the wheel was a more aggressive offset by a VERY noticeable amount.
So I would have to say that I might be getting too sensitive about the issue.. I only know that in mechanical theory, it makes a difference. But in practice, with my limited suspension setup experience, it may take a very extreme case before the effects are noticeable to the driver.