Conversely, just because you like Long Halloween doesn't mean that you must, or even should, support other examples of Loeb's work. Just because I think Morrison's JLA is awesome doesn't mean that I thought Final Crisis was anything other than dogshit, and likewise, the fact that James Robinson did great work in Starman does not excuse Cry For Justice (which, I'll grant you, is actually even WORSE than Liefeld, because Robinson's portrayal of torture is actually MORALLY offensive to me).
It's possible to appreciate bad things on an ironic level, but the problem with doing so with bad things that are still relatively popular current trends is that those bad things then crowd out the GOOD things in a given genre or medium. In the future, I'm sure that Michael Bay will be hailed as the next Ed Wood, and as much as I'd love to watch his movies in the theater MST3K-style, I CAN'T, because SALES don't take into account whether you purchase something for the LULZ or not - rather, they simply say, "Well, people bought THIS insanely bad piece of shit, so let's churn out 100 more just like it!"