I was actually at the game for work -- I think there were a couple of striking things about it in the stadium:
1) Patriot fans in the stadium outnumbered Rams fans roughly 10 to 1. It was, for all intents and purposes, a Pats home game.
2) Very hard for even those fans to get excited, though. Game was so choppy and lacked any flow or interest for long stretches.
3) Edelman was essentially uncoverable for the Rams -- he's a tough matchup for most teams, but Talib got absolutely torched by him all night.
4) McVay said after the game that he got outcoached, and that was apparent throughout. Good defensive gameplan by the Pats, but he didn't make any adjustments, and kept putting Goff in situations where he was more likely to fail. Contrast that to the Pats TD drive, where McDaniels got the matchups he wanted from the Rams defense by changing the personnel grouping. New England's flexibility, both over the course of a season and in a game, are really the key of their sustained success.
5) People were actively laughing at the halftime show.