[G2 General] imucarmen:
great questions! and it would be my pleasure to give you my thoughts and opinions on them :D

First! knock on works perfect on all the AOSP roms, all you need to do for knock off is get screen off from the play store and then get a launcher that supports double tap gesture, and then assign double tap gesture to the screen off app and BOOM! you got screen off and on with any AOSP rom :D and actually it's a bit cooler because the screen off app allows for customisations like adding vibrate and other things. It's cool because the knock on and off feature was really the only LG feature i was using all the time and we don't lose it on any of the AOSP based roms so thats awesome.

As far as roms go if you are on verizon then you have 6 AOSP based roms to choose from right now and I've tried 5 and settled on Carbon Rom as my favorite, second I say is OSE, then AICP, then Vanir, and I rank CM last because it just doesn't have enough features and options that I use. I haven't run PA yet because it seems to still be a bit buggy and I've run it in the past and though it's cool it was always a bit more than I needed. I'm definitely hoping we get PACMAN and AOKP one day because I will definitely be trying those out. But it's all about carbon for me ATM

As far as the camera goes, it takes good enough pics for me. I know a lot of guys and gals who love to play with the stock rom cam apps really miss them when coming to the simplicity of stock android, but for most of us who flash these roms it's that simplicity of stock android that draws us to it :] so if we lose a few "gimmicky" features from a camera app and perhaps a bit a quality then so be it! I'm not a huge camera phone person and have a regular shooter for when i need high quality photos (I own and run a furniture business and like getting good shots of my work and have never found a camera phone that does what regular cams do). But I personally have no issue with the camera the way it is on the AOSP based roms. There have been several people on a mission to find a good replacement for the stock lg cam app and I think they have made some progress. I would suggest starting a thread in general asking whats a good third party cam app to replace the lg one while running an AOSP based rom.

As far as missing features, let me say that I did love the stock experience on the g2. I rooted and put TWRP on day one and tweaked the stock rom the way i wanted it and it was running smooth, stable, and giving me exactly what I wanted. But after running stock for a month I was ready for full control over my device again and I've only ever had that with a rom like AOKP, or PACMAN, or Vanir, and now I've tried OSE, AICP, and Carbon which to me are even better in some ways and I'm not looking back. I'll never run stock on this phone again because roms like carbon are just soooooooooooooooooooo much damn cooler and awesomer in every way! and plus, I still got knock on and off! goodbye forever stock roms of all the big companies because you all fail compared to what the true geeks of android are pumping out. Really these companies should start browsing xda and hiring some of these guys or at least steal their work :p jk...seriously though, I don't miss it.