I am 30 years old and after 30 years of playing video games from all different genres and ages i have reached the conclusion that the Monster Hunter series is literally the best all inclusive video game series ever made.
If you erased all other video games from your life, if you removed all other hardware and software from your daily life that allows you to play video games, and you were only left with MH, you would be perfectly fine, MH is the one game you need in order to get your video game fix in life, you don't need anything else, it's a concentrated protein shake of everything worth experiencing in vidya.
-Tight, skill based movement and attacking
-Natural casual filter, if you're not good enough you're rejected first from the game itself (it's boring/it's clunky/why do i keep getting hit/it's too grindy/why is it so slow/i can't hit shit), and then there's a second rejection filter by the community itself where if you're not good enough, the skiller hunting groups will kick you out, these two filters keep the core community clean and devoid of unwanted impurities.
-Tons of content.
-Tons of replay value.
-Huge hours-to-$ ratio.
It's pretty much perfect.
If i was stranded on a deserted island with the ability to get new entries from only a single series and nothing else, i'd immediately go with MH.