It only becomes a problem in low DPS groups which really shouldnt be there anyhow .. one of LFD downsides. 1 Stun/silence should be enough and I am assuming you are taking down the healer first.
I wouldn't worry about it sounds like a lack of DPS issue and if you had got palentress you would get smashed anyhow if your dps is that low.
You were and are doing the right thing as a tank thinking how could I get this group through but there are groups that even with the best tank they are just so bad you can't get thru.
** Remember Warcraft players fail in directions you never thought possible.