A lot of this sounds like inflation.
I dont know why people do that, but I used to get the same nonsense with paintball when I played. Guys would say they get like 1200+ out of a case of paint on a DM7....with mods...and then in reality it was more like 900.
Honestly, battery life is not great when using your phone. It doesnt matter what the smartphone is that you are using....if you use it...its bad battery life.
Under normal usage (10 text, 1 hr pandora with screen off, minimal browsing, mostly sleeping while at work...which is a typical day) I get about 70 percent after work, which is about 10 hours use...but on a day where Im home and I use my phone a lot, I get a lot less. Like probably 10 percent or so per hour. Thats pretty heavy usage. It doesnt matter what ROM or kernal I use...thats the truth.
Its hard to judge/scale your personal usage against someone else. There are a lot of factors that can effect batt life. (ie, tower location, phone idle, display usage, gps, apps you use during the day etc). Its too difficult to compare your results to someone elses...unless your usage is similar.
On average, I think I get anywhere from 16-20 hours of usage on my phone on a full charge.
If I use it a lot, its even less....like 10 hours or less on a full charge. That would be using gps, heavy browsing, etc.
Dont bother listening to inflated numbers. Most people will inflate their numbers because that is what they "wish" they got out of their phone.