Worry less about the ideas you're starting out with, and more with your skill at developing it. In other words...write write write, throw stuff out, try again, edit, revise, and write write write.
A skilled writer can take the "worst" idea, the idea that everyone says is horrible, can never work, is full of stupidity...and make it work anyhow. Example: Jim Butcher => Harry Dresden riding a undead dino through Chicago.
A bad writer can take the BEST. IDEA. EVAR. and make it suck donkey rocks.
Most people get too hung up on trying to identify if their idea is "good" or "bad" and never try to run with it and see what happens.