I've tried it. It's not that bad. It seems to me that they're using their fanbase as a testing ground of sorts for different gameplay (specifically, vehicle-based) and it's improving. If only they could integrate the mako-style sequences the way they did in the original with the improved gameplay and settings of ME2, they'd quite likely have struck gold. There are actual moral choices in this DLC, interesting aesthetics, and some fun combat. If ME2 were a 9.5/10, this is about a 6.5-7/10. Not awful, not a complete waste of time, but it may not be worth spending money on.
Edit: It's also about an hour of ME2 goodness, if that's what you're looking for.