Lou's post-2012 hasn't been bad. Obviously some lots of old school moves that don't seem to make sense in the new NHL, but he has turned both the Leafs and Isles into competitive franchises where before they were laughing stocks. He ran the Devils into the ground at the end trying to keep a good thing going, but that's what often happens after long term runs of success.
Lou was a complete figurehead, in-name-only GM in Toronto. If Lou were really pulling the strings there like he did here and like he is with the Islanders, they would have never have tanked for Matthews. I do think he had some control there, like the Patrick Marleau contract was definitely his. That had Lou all over it. A 3 year deal for a 38 year old player. The Leafs also kicked their media off the team planes (which was how things were over here while Lou was here, I'd assume it's the same for the Islanders) and made them fly commercial separately. The facial hair stuff also applied over there. He was a placeholder/figurehead/transition GM there for Dubas. It's obvious Shanny was running things for the most part and Lou never had the control Dubas now does.
The Isles ''Competitive'' window looks to have been nothing but a short burst. They're on track to be even worse than Garth Snow left them.
I would say his last two-three years here were more than ''Hasn't been bad''. It's arguable that even before 2012 he was losing it, but I'll just focus post-2012. He did a shitty poor job of replacing Parise and Kovalchuk. His best attempt was a 41 year old Jagr, who did a tremendous job, but I don't think it was a safe bet he would have been as good as he was. He traded the 9th overall pick for a goalie who he allowed his head coach to sit for close to half the games, all so he could placate a washed up legend, who really didn't have much of anything left anymore, all because of who he USED TO BE and not what he then was. And I'm sure he participated in this placating himself and backed it. That's not even touching ''Matteau! Matteau! Matteau!'' in 2012.
And the 2014 draft was an embarrassment. So yeah, even if Lou wanted to blow it up, we could have just as easily failed with that, as you see the drafting that was happening in his later years. Luck would probably have it that we would have gotten one or two more good players just with more accumulated picks, but what we got with what we were working with was embarrassing.