In Team Builder, the recommended positions are actually the least needed, but the estimated time is right -- it said that jungle assassins were most needed and bottom lane supports were least needed, but, when I chose a support character for bottom lane, it told me that the waiting time would be short, and when I chose an assassin for jungle, it told me that the waiting time would be long.
The whole teambuilder "choose your position, teams are looking for _________" interface needs an overhaul IMHO. It needs WAY more transparency, like a longer list of what roles in what positions are being searched for, ideally with the # of lobbies that want such a role (so you can see when roles are in high demand or low demand).
But that's not even the worst part about the teambuilder interface...
I am 100% dead serious when I say: Teambuilder blatantly discriminates against 
! Ideally the system should be "blind" to whichever champion you pick, and only give a time estimation based on your position and role. However, go open Teambuilder and select Renekton/Top/Fighter, for example. Let's assume it says that's an "average" wait time. Then select Urgot/Top/Fighter. "Very long". Try Sona/Mage/Jungle or something equally absurd, and compare it to Urgot/Mage/Jungle (which I don't recommend btw): this can be replicated for any and all position/role combinations. Urgot is always listed as a "very long" wait, regardless of what other champions in that role are listed as. Such discrimination...
