tight

After 2 weeks of use / dev :
Slow (requires dedicated server)
Poor doc
No (or wrong) phpdoc
Over-engineered and ugly architecture
Some crapy code
Takes ages to develop simple things
Long way to learn how it works, and how to extends things.

If you don't have the choice, buy php|a's book (http://www.phparch.com/c/books/id/9780973862171)