Yes, that is a problem with some singer songwriters. You can only be introspective, bitter, angry, etc. in your songs if you can find a way to make it interesting or compelling for the audience (if you want to have an audience, that is) - be it through your skill with lyrics, your delivery, or whatever. I've seen so many singer/songwriters sing what appears to be lines from their diaries, and most of the time it just makes me feel like "Well get over it!". However, some of these people have gotten away with it because I hear their songs on the radio. And, many probably do get better with age and experience.