Every airline suffers from bad periods in terms of delays, from the biggest carrier to the smaller operators and quite often the delay is not down to the airline but sometimes outside factors.
Flyjet have had their fair share of stinking long delays but they are actually currently in the top 5 for punctuality at NCL and MAN, where their 2 757 a/c are based and from what I hear passenger reactions are very favourable, particularly NCL. It seems that they made a good choice in NCL and lets hope it stays that way as they are operating a fairly large winter programme too, from both NCL and MAN.