here's what to expect: LoL is a team game, so let's use another team game as an analogy- football
imagine, instead of having tryouts and ending up on a team roughly two or three times the size of the team that gets to play an actual game in highschool, you were just randomly shuffled into a team with people you've never met.
the sorting algorithm doesn't take preferred position into account, so of course 3/5 of your team wants to be the quarterback. and oh yes, did I mention you have about 2 minutes to sort out who plays what position and what plays you're going to try to make? because you do, and the clock's ticking.
so you get the positions sorted out, but you don't have time to decide on plays, so rather than think about how their decisions effect the team as a whole, everyone just brings their favorite skillsets to the table and hopes it works itself out.
turns out, one of the guys who wanted to be quarterback ended up as a wide receiver. problem is he can't catch for shit. but that's ok! the guy who did get quarterback can't throw!
your lineman's good, but he's (justifyably) pissed at the quarterback and wide receiver, and he doesn't realize that shouting at them is just making them play worse.
you ended up as a running back, and you're pretty good, but with one problem: the quarterback wont call a running play. so you're begging him "come on! you know you can't throw, and you know the wide receiver can't catch, so why do you throw to him every single time? I'm right here! I'm not the best but at least we could make SOME progress!"
eventually, you get through to the quarterback and he does pass to you... at the exact moment the lineman accidentally lets them through. so you get tackled, and it looks like you're a bad player when you were really just given a shitty chance. and now the quarterback is shouting "see, that's why I don't pass to you!"
now to heap onto this mess, there's also ELO hell. don't get me wrong- ELO hell is a myth, but it does have it's foundations in reality. you see, while the sorting algorithm doesn't take preferred positions into account, it does take skill level. and every "section" of skill is determined by whether or not you can carry a bad team by yourself. to do this, whenever you're up to move up a section, it deliberately places you with bad players to see if you can win anyway (which looks like shitty luck, if you don't know what's going on- hence the ELO hell myth)
and the only upside in all this is the enemy team is in the same boat. personally? I'm sticking to ARAM and teambuilder until riot adds in some elements from teambuilder into ranked. it won't be a permanent fix, of course, but it will be slightly less of a clusterfuck.