Finished the Bartimaeus trilogy, not sure what to think about the ending. I think it ended well, but it ended too abruptly. It could have had 2-3 more pages to explain a bit more and tie up some things.
Overall the series was great, I might even say better than Harry Potter, but the ending... I can't say it's "bad", it isn't bad, it just ends too swiftly.
"You lack the requisite spine and testicular fortitude to study under me"