what i mean is that a lot of the profiles are "raw" - attempts at relatively neutral amp settings, with no boosts, and no effects turned on. that can sound especially "dry" depending on the patch, and if you're demo'ing them solo, they can be easily passed over.
i disagree that ANY patch/rig can claim to be "mix-ready" when an optimal mix is variable based on external parameters. for example, what the other instruments are and how they are voiced; what guitar/pickups/pick/playing style are you using as opposed to how the author dialed in the patch/rig. but of course, I get the general sentiment, and would agree with you - if you use the patches in the kind of mixes you'd expect to hear with the rig, and played it on a similar guitar, it should sit nicely.
but i would also say that upfront the unit is far more dialed-in than any other unit i've ever had. i still like to tweak, but a lot of the profiles are amazing without doing anything to them.