lack of communication = we don't know what the hell they're doing.
seeing their own apps on competing platforms updated more frequently than their own platform and gaining more features than found on their own = raises eyebrows.
long dormant periods (6months) between announcements and releases = either announce something that gets released soon (iPhone, announcement > release takes like a month), or release small updates every now and then. Why build up something, then just completely throw it aside killing any momentum and hype that was built up. Paper launches are bad mmkay. Their in a distant third place, they needed to make a splash.
Lack of any new devices or flagships = Are they even commited? You cant compare a Lumia 830 with a galaxy S5. There would be more checkmarks against the 830.
"Just wait for windows 10" = Just like wait for mango (wp7.5), wait for WP8, Wait for windows 'blue' (WP8.1)? end result seems to be the same each time....wait for...not much.
I'd say its more venting due to frustration and the feeling that you're getting shortchanged and maybe got suckered into a possible dead end path. They already pissed off Lumia 900 buyers with the 7 and 8 transition. They annoyed anyone wanting a 920 with the carrier exclusive thing. Verizon seems to be screwing the pooch on the icon, they're pissing off some loyal fans right now with the lack of any real meaningful Skype updates, the fact that office still sucks on wp and is actually good on ios now, Cortana expanding to ios/android in the future, the OneDrive hamburger menu (I dunno about that one tbh, but it did look a bit discontinuous)....We're still waiting for the denim update (and with it WP8.1.2?) and there are still people waiting on Cyan and WP8.1.1. Theres already rumblings about things being delayed....
I think some users are just getting fed up with the waiting game. Especially with the less than stellar track record MS has.
Remember when the beta test is over? Yeah back with the Lumia's and WP7.5. Seems to me now that it was actually an alpha test then, and the beta test is just now getting started.