Star Wars Arcade (the original):
This was amazing to toddler me, and probably is what got me hooked on arcade games. Dem Vector Graphics
TMNT: My first arcade obsession, probably because I was obsessed with Ninja Turtles at the time. Also got me deep into beat-em-ups.
X-Men: Yeah this one is self explanatory/everyone knows and loves it. Nightcrawler 4 lyfe.
SoulCalibur: The graphics on this were mindblowing when it came out. It was also my first "competitive fighting game" where I was actually relatively good (I was mediocre at SFII when it came out and terrible at MK). I say relatively as in the "Salisbury, MD" arcade scene (lol). I was the boss though, I'd regularly run through lines of 10+ people multiple times using Edgemaster (or Mitsurugi when I was feeling cheap). It would be years later that I'd learn outside of backwater towns and my group of friends I actually was average at best at fighting games.
Marvel VS Capcom: Holy shit this one was fun. I wasn't nearly as good at it as I was at SoulCalibur but I had way more fun with the awesome craziness you could pull off on the screen. I still prefer the music/levels/general aesthetic to MvC2
After that the local arcades started closing down, and soon after I'd go to college and console releases were as good if not better usually than their arcade counterparts of the style of games I liked to play, so with the exception of going to a Dave & Busters a couple times or getting dragged to really trashy places by friends hooked on DDR that was the end of my arcade experience.