I have found that I am a spectacularly average composer - of all the things we had to compose for college theory class, the only one I did that I really liked was a minuet and trio (written in G-flat, just because).
My only other composition that I've even really considered to be above average is a Latin Mass...inspired by singing them three years in a row in an honors choir, and running into tenor parts that sat in the D-E-F-G range forever. If I remember correctly - has been several years since I looked at it - the tenor parts in mine don't go above an F, and don't set up shop in the vocal break area for pages at a time. The tenor soloist, on the other hand...
Over the 15 years that I've been teaching, I have gotten pretty good at arranging - mainly from piano/vocal to string ensemble, although I have done a few junior high band arrangements (three for my master's thesis project).
One of "my kids" asked me if I could set a poem she wrote to music as a present for her boyfriend (now husband). She thought it was great...I thought it was okay.
On the topic that surfaced around 50 posts ago...
Sanity is highly overrated. I tried it once, but didn't like it.
If you don't think I'm insane - I play bassoon. And viola. And teach middle school.