thankfully blizz realized how badly they fucked up SR in season 2. Almost everyone is clumped up in gold/plat even if they're really a bronze/silver level player because of how generous placement matches were in regards to starting rank.
i don't really agree about the shit teams. yeah, you get unwinnable matches, but so does the other team. don't tilt, don't play ranked when tilted, communicate, and BE POSITIVE in comms and you will climb. i seriously can't stress enough how much staying positive helps.