Its flawless with functionality, sure there's ALWAYS little minor bugs, even in stock. If you are so unhappy with it, then bake your own ROM, or go back to factory and deal with Google on the bugs, or better yet, rewrite the code to fix whatever issue you have, and share the fix with us, but do not complain and do nothing more to help the situation!
Regarding bugs, see how much support you get with reporting a stock firmware bug to Google and see if it gets fixed (cuz they ALL have them), all ROMs have bugs, LOS, custom, and FACTORY! The ROM is FLAWLESS! EVERYTHING its SUPPOSED TO DO, DOES and WORKS, no service or RIL issues whatsoever, so I do not agree with your comment at all. Newbs need to understand, custom means possible bugs, so we do this at our own risks, to me, this ROM IS PURE FLAWLESS, with minor user issues, these issues DO NOT AFFECT usability or RIL (text/MMS/calls), data, WiFi, GPS, and ALL phone functions, so yeah, this ROM IS FLAWLESS!!!
To the rest of the XDA world, this ROM is FLAWLESS! It works VERY well, with a very few issues that I am sure can be fixed if the user really wanted to work around them. I just dont use GA nor care about the stock launcher so I dont fix it!