Personally? I would say no, I would favor crit for a yellow stat, but that isn't based on hard math or testing. I would simply favor it for your DoTs that can crit, while the Haste will only improve your filler.
If you want to figure out the math, you can do a damage per time calculation. You know what each of your DoT ticks for and what Haunt, Shadow Bolt, and Drain Soul tick for. Use your haste value to calculate the time to cast, divide damage by time of yours it takes (down to that 1 sec minimum), and compare the improvement in values for how many you fire off.
I can tell you now that the determining factor will be only gaining damage value on Corruption (hasted ticks through glyph), and Shadowbolt and Drain Soul for your fills. There will be a degree of saw-tooth in there where you won't get value until you can squeeze an entire extra shadowbolt in. The same will be true of Drain Soul ticks squeezing in.