I loved many of the series members have listed. (Notice the past tense.)
Great start (and in a few cases, the second book got better. see my add), but then the story gets
tired. Same characters doing MOS

in each volume. (I mostly blame the Fans and Publishers for this)
McCaffrey (Pern) avoided a lot of that with different sequences in the same setting
I will add in my picks: (at least the first 3 or so books)
Lisanne Norman's
Sholan Alliance
Carrie Vaughn's
Kitty Norville
CJ Cherryh's
Chaunar and
Foreigner
MZB's
Darkover
LE Modessit's
... 
(Just too many volumes in most of them)