No banned cards as of the final FAQ! But 32 restricted cards (the restricted list in that game meaning you can only one card from the list in your deck [you can include a full playset of it, though], which is how they broke up negative play experience combos). I'd say that most of the serious errata is clustered around the early cards (which had a legacy from the CCG to overcome), and, uh, Damon's designs, many of which were just YOLO'd into print as far as I can tell .
All in all, I wouldn't say the errata + restriction list was too bad for a game with 7 full cycles & 10 deluxe boxes, especially given the major shifts from CCG to early-LCG to newer-LCG. Ideally, it would have been playtested better.
Honestly, that's probably what it comes down to for netrunner, too: games need the best playtesting possible