In no particular order:
I wasn't into 3D games. They looked ugly compared to sprites, controls weren't tight and loading took long in comparison.
Enter RE2. Background were impressive, controls took time to used to but the game was engaging. I didn't care much about horror either but I was into story about an evil corporation and the location. I love main PS1 games along with their remakes. Have deep respect for 4 but hate latter half and just killing the payoff of post-Veronica. 5 and 6 were fun on their own and both have their own issues. Never touching 7 or 8 because 1st person but I know people (will) love them.
They are fun and challenging games that have good characters.
REmake1, RE2, RE3, REmake 2 are my favorites but others are also worth to play.
Megaman 2 is legendary but 3 was the one I soloed. It has slowdowns but they were just amazing for a pre-teen kid. Taught me not to give up. X series is the ones I love a bit more because of dash and wall kick. Got good with X3 that I spent so much time with it.
Also love other spin-offs.
X1-4, Battle Network series, Legends, MM2-4, Zero series. All are good.
Didn't get into it until Huber's high praise along with Ben's. Started from Zero and jumped into 6 when it came out. Beat all 7 of them
this year. Love the story as a whole. Sadly 3 really needed Kiwami treatment because that game is super rough to go through gameplay wise. and 5 didn't have a focus thus making 6 a single protagonist was a right decision.
Zero is top tier followed by 6. 4 is also good and Kiwami 1 and 2 after that. 5 has some good stuff and so do 3. It's still worth going through all of them.
1st 3 are amazing and pretty much a complete arc. Sadly spin-off of Miles Edgeworth never had its sequel translated which i also worth going through and different enough from main series. Love the characters and how the story is well tied together.
Metal Gear Solid
MGS1 is a masterpiece (Twin Snakes can F*** off). The plot twists and crazy stuff it had just pulls you in and grabs you until the end and "The Best Is Yet To Come" kicks in. MGS2 is my favorite for it being more futuristic and being bonkers on its own. It was ahead of its time. Enemies working as a team and not being totally idiots was what also elevated the stakes.
All of them have their strenght. 1&2 are a must. So is 3 though the laughter really ruined part of it and possibly one of the best moments in videogaming. 4 was a bit weird and sadly still PS3 exclusive? 5 has amazing gameplay, possibly the best in 3rd person but the "open world" ruined what MGS were known for. Solid storytelling that was taking a backseat. Still a fun game.
Peace Walker is also worth playing through.
Sonic the Hedgehog
Sonic 1-3 and Mania are amazing and a proof they are a great rival for Mario franchise while also having their own strenght.
Sadly series is a rollercoaster otherwise. But rarely a franchise that has a long history is all killers no fillers.
Love the story in 1st one, enjoyed co-op in 2nd and how it handled sidestories, I have 3rd one (need to mod my PSP) and love 4th's evolution in gameplay even if it has some cringe moments. The gameplay is a star of its own. Bonds.
Love dialogues and quips. Characters are enjoyable though only interesting villain was Rafe which is why UC4 is my favorite along with the settings. People might not like it having many slow moments but as a whole I just loved it. The Lost Legacy is also great. 3 was my least liked one but it wasn't bad. 1-3 had a mechanic or a thing that just annoyed me and wish they weren't there. Big fan of Indiana Jones movies so this was closest we have for them.
A franchise that has become bigger than itself. So many games but SMB3, SMW and SMK are enough to make it into a list. A Mario game is almost always solid whether I care to play them or not. Personally Sonic and Mario are equal to me.
SFII was my childhood,enjoyed so much of it (end credits is fire). Got hooked to it early and thanks to X-men vs SF at the arcades I got more into Alpha/Zero series, other vs. games and spin-offs..
Chun-Li, Ryu and Ken(especially being different starting from Alpha series) became my favorite characters thanks to other media (SFII animated movie is the best vg movie IMHO)bringing them more into life.
Shoutout to franchises that I loved but didn't make it to my top 10:
Final Fantasy, The Legend of Zelda, Suikoden, Breath of Fire, Shenmue, Onimusha, The Legend of Heroes, Dark Souls, Gran Turismo and Gravity Rush