

In the patch notes they advertized a new system that gives 30-day comms bans instantly during the match, and it even names and shames, and people have been comically congenial in my (admittedly limited number of) games. If I was a new player I would still probably turn off chat for the first hundred games or so.
After MGS2, you should read up on the awful discourse surrounding that game at the time, specifically the E3 trailers.
Look up what happens in the non-Solid games at some point before playing Ground Zeroes and MGSV
If you had not already mentioned it in the post, one of these tips would be “watch Escape from New York”