I've liked the events

MasterMasterTimelord

A lot of different teams, not only the usual.
Made to all the players (not only the top 100 of 5000)
Good way to train with the character
Not time consuming
Funny
To be 100%, citadel pack should be with christals and not a bundle

Bomroll

My borrowed toons didn't fire once, I was done in 10 mins then back to looking for something to do