I'm not that much of a black hearted harpie. Plus you seem nice enough and willing to listen to both sides unlike most Bethesda fans that come here. Not about to let you get thrown into the lions den.
With MATN is because he seems to have no understanding at all on what made the original Fallout's great. He most likely got his start in Fallout on either 3 or 4 and probably views the old games as outdated or inferior. Plus, as
@Norzan said, MATN is a view whore and knew that lambasting a popular cult classic game like New Vegas will get him a ton of views, especially with Bethesda fans as many of them hate New Vegas. If he did that with the originals the likes of the Codex would have eviscerated him.
If you want to know why many of us hate Fallout 3 here is a video series that talks about Van Buren. The Fallout 3 that could have been. Doing so you can see why many of us here are so jaded with Bethesda Fallout: