Not because it's OP in pvp, but because it was your favorite growing up, or you think it looks cool or it just plain fits you?
I tried tons of different ships, trying to find one that was just.."me". The Gal X, the excelsior, the nebulas, practically everything but the defiant and the odyssey.
I was rather overjoyed when the Steamrunner came out. Always liked the look of the thing, but didn't want to buy the Armitage for the Zephyr skin. Not only did I get the ship I wanted, but it turned out to a very tanky escort, which fit my engineers playstyle as well. Plus there's not a gazillion of the things flying around. Nothing I would hate more than rolling up in an Armitage next to 12 other ones outside ESD
So who flies the Nova because they liked how it looked when Kim flew it? Or who flies an assault cruiser because they loved the scene where it jumped in front of the Defiant in "First Contact"? Anyone still running a Miranda at VA level just because?
I run a setup on my Steamrunner that many would probably laugh at me for (Torp boat!), but it actually pulls some impressive DPS in ESTFs, it's fun, and I enjoy the hell out of it. What more could one ask?
Let me put it this way...my original headstart character in STO is a male human, with Asian facial features. He and his crew previously used the Wrath of Khan red or maroon jackets, and later upgraded to the Jupiter-style modern versions of the same.
He uses a particular C-store cruiser, and I'll probably be upgrading to the Fleet version of that ship soon, since it's just been released.
If you couldn't tell I'm talking about the Excelsior, I dunno what to say. I used to PvP regularly, and if I start again with a fleet upgrade, I know folks are gonna grumble about a Pay-to-Win ship. Honestly, though, I've never cared. It's just happy coincidence for me that the ship I like is actually pretty damn good.
Also, I have a character, a human science officer, in a Nova-class ship, with nothing better then Mk IV greens, that I intend to slowly but surely level all the way to 50 (using the same gear I have now) on elite difficulty, seeing as little combat as possible.
Character and away team do not use armor, kits or personal shields, and use nothing but tier I stun phasers and rifles.
If it's ever going to be released, I am going to fly the Yaeger Class....
Eh, that was a rather lazy and mutated studio model kit-bash. The general shape was interesting, but they made no effort whatsoever. The Intrepid saucer is so blatant it is insulting to fans of classic designs like the Connie and Galaxy.
I fly my Sovy because it looks great to me, and it's one of my favorite fed ships (even though the design flaws still make me cringe). And when the Romulan faction finally comes out, you will see me living in nothing other than a D'deridex and/or Scimitar, just because the Romulan warbirds were always awesome to watch in the show, and the Scimitar, as terrible as it's turn rate will probably be, was just so badass in Nemesis, I couldn't say no even if I wanted to.