cherry

Not all good GUMI songs have a 1000 favorites or 100,000 watches.

Although, as a general rule, if the song's favorites is about 10% the amount of watches it got, its not a bad song (varies with opinion of course). Those with a lower percentage are most likely lower quality though, and not worth listening to (no exceptions I've seen so far... then again, I've been avoiding those with lower than 10%, so who knows?)

It's hard though because a lot of GUMI (and other Vocaloid) stuff comes out so you never know...