Yeah. Pretty much the same for me. I tend to only use it as an escape when my team can't peel for me (which if that is happening you usually are already in a bad spot) or clean up duty. In 1v1s you are absolutely right; or even in bot lane 2v2. It's just it feels like her ult doesn't offer anything to the team once a team fight begins. Generally the 'popular' carries bring something. Miss Fortune, Ezreal, Graves, Draven, Caitlyn, and Twitch all have ults that hurt the enemy while not putting them in harms way. Varus, Tristana, and Ashe bring utility. Quinn bring an execute that she has to be in the center of the enemy to use or worst case a tool for running away that only benefits herself. I want to like Quinn but her design makes it hard.
Corki's ult doesn't really add much to teamfights, being more helpful for harass and siege. Once you get into a fight you can throw rockets for a little extra damage but it's going to run out of ammo fast if it hasn't already by the time the fight really gets rolling.
Quinn's interesting in that she's one of the most defensive carries. Played her for the first time in a 2v2 the other day against Riven and...hm. I can't remember who the other champ was. Another bruiser type. Anyway, Riven + otherbruiser vs. my Quinn and Ashe. Ashe got gibbed something like 7 times that match; they only managed to catch me twice. Between the knockaway dash/stun/slow for an anti-gap closer, the AE blind to prevent damage if you get collapsed on and the ult to either flee or chase, she's incredibly good for safe positioning. Her lack of consistent steroids (her only major one outside of the melee-range ult is shooting a target clipped by her random-targeting passive, not great for dps) means pretty much any other carry is going to outdamage her in a straight-up fight, but she can get herself out of nasty positions a lot of other carries couldn't and protects herself better than a lot of them. Just pays for it in terms of damage potential which, let's face it, means she's a weaker choice for end-game carrying since she just won't pack the punch of a farmed-up Vayne or Tristana or someone else with a built-in steroid. Draven would hugely outdamage her...but requires a lot of precise movement to do that damage, so I think he'd be a much less safe/consistent pick in the end anyway.
If I were the type to play ranked, I think I'd consider picking Quinn if I saw the enemy team had picked a kill lane for bot. Focus on outfarming them, play super conservative, avoid dying, profit. Don't think I'll be getting her anytime soon, though; I have enough AD carries already.
In other news, the lifecycle of 1v1-spawned friendships in League:
- Play a 1v1 match against Player.
- Win above match heavily; be told by Player that you won for reason X.
- Accept friendship and rematch challenge from Player to prove X.
- Win rematch without X on your side (ex: if X was "you're AD," play AP in rematch).
- Be unfriended by Player.