I used to love NC when he was in his prime (back in 2008, 2009, and early-mid 2010). But as years went by, the quality dwindled and he became less and less and less and less funny. I can name several reasons why.
First off, his reviews are WAY too long (like 25-30 minutes) and he doesn't really go in-depth. It's basically movie clip, unfunny joke, movie clip, forced meme we've seen a bajillion times, movie clip, screaming obnoxiously, movie clip, another unfunny joke with the possibility of a cameo, movie clip, more obnoxious screaming, movie ends and he gives a short summary. And many times, he would rehash or recycle old jokes, gags, memes, etc.
Even Doug himself admitted NC was getting stale when he retired the character. I can understand if this was a special occasion or something like that, but his hiatus was too short (it didn't even last a year) and every two weeks is not enough to keep it fresh.
A lot of people got sick and tired of NC, so he's pretty much milking a dead cow. He's doing it because the complainers on his site want him back. Real fans support you no matter what decision you make. If you don't wanna do something anymore and you don't have the passion anymore, STOP DOING IT.