I'm with you, OP, but for different reasons.
I wasn't a fan of Carley/Lee as a romantic relationship for a lot of reasons, the main reason being I think they had a great friendship and I was really hoping that Telltale wouldn't force a romantic relationship between the two. There aren't a lot of strong "opposite sex" friendships in games that don't have the option of romance when both parties are single. I was really disappointed when it seems like no matter what you do, Lee tells Katjaa that he liked Carley after she dies. :/ There are other reasons why I don't like the pairing but I'll keep it to myself because I know I'm one of the like five people in the entire universe that doesn't ship it.
Katjaa and Christa are already taken for. I prefer Katjaa with Kenny and Christa with Omid. We don't know enough about Brie and it seems like she was with Vernon; not that it matters, because she's dead anyway.
Molly's interesting but I don't think she is in the right mindset to be in a relationship right now and to be quite frank Lee isn't dextrous enough to keep up with her. lol Also as much as she likes Clem, she has said a few times that she really prefers to be on her own.
It really does depend on the playthrough, and I've played loads of different ways... but in about half of the playthroughs, Lee/Lilly is a really interesting relationship that I would have greatly preferred over Lee/Carley. I think they're a better match in a lot of ways, in certain playthroughs. Obviously not in ones where you go hard for Kenny, but yeah. It's also obvious that Lilly cares a lot about Clementine... look at the end of episode 2. Is it Carley playing with Clementine in the video Jolene made? Is it Carley who gave Clementine hair ties for her sleep? Hmm... And just imagine the scene where Lilly leaves Lee and steals the RV if they had been romantic with each other. sigh
So tl;dr I voted for Lilly but I'm about 50/50 Lee being with Lilly and Lee being alone and focusing on raising Clementine.