not exactly bad qc.compared to others they are still considered not bad.there are bound to be some bad pieces. the 80s and 90s pieces could be better maybe cos the bad one have been eliminated and taken out from the guitar market, so what u see are the good ones.
les pauls have also gone from solid body, to swiss cheese type with 9-holes for weight-relief to the current chambered.the les paul standard and classic that we used to know them as have been discontinued by gibson.or maybe just renamed as les paul traditional and the 2008 les paul standard.but these are still based on the same old stuff, with chambered body and a few improvements to suit the modern les paul player's needs.
for the specs, they have all the while been almost the same.except for the flame tops you get now and the plain tops that were now history.the knobs are also different.theres a circuit board now.the shape of the neck is different too.you also have neutrik jacks and locking tuners as well.