As 20 century boy said the qc was quite poor and I believe the Baldwin company owned Gibson at the time so they took a LOT of cost cutting measures to maximize profit. During this time you'd see LP's with maple necks, maple fingerboards (kinda cool looking in some cases), the infamous "pancake" bodies, multi-piece tops (many times 3+ pieces), cheaper hardware, the list goes on. I've played a few from the era that were actually quite nice and could hold their own, but as a general rule they're few and far between. Then you'd get the oddball models like the Sonex with it's plastic body or the RD Artist with the optional Moog electronics (which are actually quite cool) and all-maple construction (talk about heavy). There were some pretty cool models that came from that era though like the 25/50 Anniversary LP Customs and the LP Artist, Explorer 2, V2, Firebird 2 (FMT), and LP Deluxe (although they may pre-date the Norlin era). I'm not much of a Gibson historian by any means, but being a chronic GAS victim I've noodled around on more than my fair share of 'em from all eras so I have a somewhat reasonable idea of what was going on with 'em. You could also check over on the Les Paul Forum for more in-depth info about the topic.