1. Nicko McBrain. Have never gotten over my disappointment with his drumming from the day in he joined Maiden, particularly as he replaced the powerhouse Clive Burr. In my view, he has marred every Maiden release he has played on. Of all the drummers they could have chosen to replace Clive, they picked a guy with a clumsy, ham-fisted technique and a shitty, tinny drum sound which sounds like someone hitting the top of a garbage can.
2. That Steve Harris did not give Clive more time to get his shit together.
3. Janick Gers. Completely unnecessary. Adds nothing.
4. The production on the first album (an album which I should add I love).
I know Maiden is Steve Harris' brainchild, but the album is absolutely drenched in bass. What a shame Martin Birch couldn't have produced the first album too.