Final Fantasy VII definitely opened up the realm of RPG's to me, before that my experiences were limited to the Legend Of Zelda and D&D with friends. Since then I can say that RPG's have been a staple of my gaming diet so to speak and probably my fav genre as long as I have the time to sink into them now as an adult.
On the negative side of things, some games take themselves too seriously when playing online, I find alot of fighting games are like that online, Grand Theft Auto, RDR was like that or just really poor as far as matchmaking went. I feel like Call Of Duty has also gotten to be like that. I still enjoy playing online in Titanfall 2, Modern Warfare Remastered, Battlefield 1, Star Wars Battlefront and Mario Kart 8 Deluxe online. I don't consider myself competitive enough to take it too seriously anymore.
I'd also like to add that as I've matured as a gamer, I've come to appreciate games with good multiplayer modes, when hosting game nights. Its something that is kinda lost on Microsoft and Sony, while Nintendo seems to still understand its a huge positive to bring people together in a room to play a game where everyone can get into it, no matter if they're casual or more experienced.
Those are the experiences that have come to mind when thinking about changes in my mentality as a life long gamer.