I finished this last night and I seem to be at odds with most people because I really quite enjoyed it. It kinda reminded me of the old EU.
I thought the story was paced well, made individual aliens a threat instead of fodder, and used some concepts which were interesting.
The whole black goo bombing thing was unnecessary, and any number of other ideas could have been used, but I guess it ties it in to the rest of the currently EU, so that doesn't really bother me.
I enjoyed it.