I don't have any issues with ice control. Yes, flash freeze sucks, but I don't use it unless its the last thing left to use, which is never basically. It's not too difficult to farm +4/x8 with ice/ice, given you know how to overcome or redirect the alphas.
I use 2 "control" chains depending on what is on cooldown. The first is: spring attack, power boost (or boost, spring) glacier, ice slick, then AoEs and mopping up the stragglers. The second one is: summon Jack Frost in the group, ice slick, spring attack, AoEs, clean up.
Never do I face an alpha strike, which is crucial for efficient farming. Glacier has no animation, and Jack Frost usually survives the alphas. Ice Assault has zero animations and good damage. Chilling Embrace does what Shiver should do, making mobs so slow and so lacking in attacks that I can stand still and melee the "runners".
I see the problem with shiver and flash freeze, but they aren't even necessary to make ice control beastly. The player makes or breaks the primary, and that goes for every power set.
