Oh man where to start... I LOVE Warrior Cats so much, it's ridiculous. I'm actually on the wcrp forum as well because I love it so much. I love reading the books, I love thinking about the characters, plot and WORLDBUILDING (like how they messed up their original working of StarClan and the Dark Forest). also shippings and AU
Also, I'm all caught up with the series, actually just finished reading River of Fire (5th AVOS book) a few days ago. As for AVOS, well, it's a mixed series. I love some parts of it, whilst others not so much, and opinions on the series seem to vary.
The first AVOS book was great - I loved it a LOT. The third book, which seems to be the majority's favourite, I actually didn't like that much myself because it went too fast, and no normal Clan routine (and though I know a lot of people find the routine boring, I enjoy reading about it.)
If you're planning on reading AVOS, I won't spoil anything but for the sake of your own enjoyment, I suggest reading Tigerheart's Shadow AFTER River of Fire (ROF being released two book earlier was NOT a good move on the publisher's part)
As for the characters in AVOS: the first book features only one POV, the others three. One of these I personally greatly dislike reading about, another has grown a bit stale and boring and the third is AMAZING and this character is now one of my new favs.
ALSO YES ANOTHER DOVEWING FAN!! She gets so much hate, it's ridiculous! I love her too and I actually love DoveTiger too (which is hated a lot as well I found out since joining wcrf...)