I mean, seriously progress.
My friend and I did placement matches recently and got put in Silver 4 (also did only placement matches at the tail end of season 3 and got Silver 2 and 3). However, we just keep losing games and are on the verge of getting dropped to Silver 5. It's always the same kind of crap. Either someone rage quits before 10 minutes in, someone trolls and picks a stupid character (Garen support...), plays a character for the first time (FIRST TIME VEIGAR!!!), or no one seems to know what to do in games.
My friend and I typically carry games in normals easily, because we've learned from Diamond level streamers how to play the game - how to focus objectives, push lanes when optimal in choice - but it doesn't matter when 3/5 of your team mates either constantly feed or are pretty much dead weight. We're really wanting to get better at the game and push toward higher ranks, but it seems difficult to do so.
How long did you guys take to either get used to the ranked scene (or whatever the hell is going on with us) until you guys started to improve and progress through ranked play and climb the ladder when you started playing ranked for the first time?