Please Balance Matchmaking

Disclaimer: I know that MMR and Rank are not exactly identical but they are generally quite close with the exception of when really good players start playing a new account or have their rank reset at the start of a season.

I'm getting tired of teams having a wide ranking differential, where a high rank player is deemed to offset a lower ranked player. This is especially frustrating where, as a support, I'm put in a lower ELO game and am expected to offset a bad carry position. Look at this:

http://i.imgur.com/jhY5DDP.png

How is this possibly fair. To begin with, the other team has an average ranking of about halfway between Plat 5 and Plat 4 where my team has an average ranking just under Plat 5 (OK, I can live with this, its close enough). But a ton of our average ranking comes from the fact that our support (me) is Plat 2. Its just not realistic for a support to carry a horrible top and jungle. Yes, a support has an important role but it is to support the other players. And you can't support players who are vastly outmatched.

Ideally, all five players on each team would generally be within 1-3 ranks of each other (e.g., Plat 5 - Plat 2). Furthermore, or alternatively, the supports should be evenly matched and then the OTHER four positions should be balanced. You should never have a support on one team balancing out lower rated carry positions.