I haven't been doing Ranked matches because I want to find a group of good players to play with so I can actually rank up
Personally I recommend you don't do this. I played ranked with random people always and it teach you all kind of stuff, from defensive positions to rush, if you're able to cope with any team, you'll realize that whatever rank you're able to get, you won't go back since you're truly getting better. If you get a fixed team where everyone kind of knows what to do, you'll be good at one thing, but once you're in a position were you can't do that thing, you're more or less screwed, that's the reason why most users complain they went from an A+ to a C+ (they say it's because of "bad team" but it's really because they still don't manage to have teamwork). Granted, some teams are terrible, but those are hard to come by once you start leveling up; other teams are super good but I found out that if you take out one of their teammates, the others are super screwed since they relay too much on that person fulfilling certain task. This is just my 2 cents though, feel free to ignore it.
It's pretty awkward being the only one that level. Do you hang back and let the other team of noobs get it? Or do you kick a little ass and let the noobs on your side level up? There's no right decision.

I always leave as soon as possible when I get put in those match-ups. They probably groan when they see my level 42 name slide in.
I feel more like a teacher in those situations, I just stand back and follow the newbies around, protect them when they are getting rushed and let them cover some area, if my team is getting too much area (more than 50%) I go back and let the other team advance a bit. It's fun when I do that because I just stand still and see the other team right in the eyes, they see me there, standing, and then I simply run back letting them know I won't attack them and that they are free to take the area. When the round is over I don't really care if we won or lost, as long as the porcentage is almost 50-50 I think it is a good incentive for both teams to keep playing. Not me though, I just choose not to continue playing since I rather let them have another newbie instead of me.
So yeah, I'm generally just a person who plays for fun rather than competition, I like winning, sure, but I don't like winning if the other team was clearly on disadvantage (less players, lag, low levels, etc). Maybe I'm just crazy or whatever, but I try to let other players know that I'm not playing super hardcore all the time... except on Ranking, screw you, I'm going full apeshit on your ass.