First the bad: The science isn’t really there. The lightning and black hole weapons just wouldn’t work and the explanation is that it is stolen alien tech that was installed but not understood.
The one thing that really got me was in the first book one alien vessel almost destroys the fleet on its own. Now there is a fleet of aliens that outnumbers the mind-refurbs by 2:1 and yet they lose.
The good: Nice action, good character interplay, interesting situations.
As long as you aren’t too demanding this is an enjoyable diversion.