Dead thread, I realize. But I thought it might be worth resurrecting after some recent runs I made through DCS and Dantius with a CQC-oriented Sentinel with some use of Cryo Blast and Throw.
My experience has been that Cryo and Throw are *amazing* powers as part of the Sentinel's control portfolio (which may also include Stasis, Slam, NS, or Reave). Although individually situational, Throw and CB together allow you to control enemies in a lot of different situations.
However, I don't usually use Cryo + Throw together per the "Shatter Sentinel" kind of build, for the reasons pointed out above. Any time you have to link two Shep active powers in series to accomplish something in ME2, it's probably taking too long (especially if you have to wait for something to fully freeze before manipulating with Biotics). Even with Adept Pull + Throw (which is about the fastest dual active power combo I can think of), I usually get the willies waiting, and thus generally prefer squad Pull/Shep Throw.
So back to Sentinel, I usually only take Throw to rank 2 before developing other powers, and if evolving to rank 4 later in game always take Heavy Throw, since it has the best chance of killing an unprotected enemy outright in situations where my main goal is to temporarily disable. Also, Throwing an enemy out of play is just plain fun, so having the extra gusto to eject that enemy even more forcefully is worth something in its own right.