The 4 original Typhon Pact novels have had mixed reviews. Personally, I love RBoE. PoD and ZSG were okay, and Seize The Fire was just crap. But, that's my opinion.
Novels like Plagues of Night/Raise The Dawn, and now Brinkmanship, have been very good. Especially Plagues of Night and Raise The Dawn, a duology wrapping up some plotlines from RBoE, but also giving us some very good character development for some of our most beloved DS9 characters, rate as two of the best TrekLit novels as of late.