I agree, I commented elsewhere that the first piece I listened to was very low-quality. But by raising enough money to hire the London Symphony Orchestra, they can conceivably move up to having lots of quality music.

One suggestion for museopen: like haberman says, a big problem is "wading through" the low quality recording. So when you start to record higher quality orchestras, make it very easy to tell between the "good quality" recordings and the cheap recordings.