It’s military glazing in the same way Twin Peaks is FBI glazing is about the best way I can put it, especially in response to your comment about it being kind of goofy and not chuddy. MGS is sexy/goofy in the best way.
If we want to do it chronologically, it would be MGS 3 and then MGS V, MGS 1, 2. 4.
3, V, Metal Gear, 1,2,4 would be interesting.
Anyways, if you start with 3, you can continue with 1 (and then 2 and 4) or go to V and then 124. You should start with 3 imo. Biased since it’s the first MGS I ever played but I can’t imagine any other intro. So much pulpy fun, and you can go into the story with a blank slate.