yes, I can agree with 208T16 beeing not reliable. they made upgrade of front diff housing, and it was looking it's better, but now it's question mark if that was the problem in car of Breen? now in Kevins car it looks like power steering or alternator belt?

in case of Fiesta I don't agree with all your complains. Look how many those cars are running around the world. Most technical issues with that car happen because of preparation/servicing mistake (I'm not telling it's like that in case of M-Sport Poland and their car) or simply bad luck. That car - Fiesta, has one known problem - steering rack, but it lets you finish the stage and not forcing to retire. Same with recent wastegate problems. And it's not happening so often, trust me. Broken driveshaft is more like bad luck, as it happens very, very rarely in that car. Same like fire in engine bay - only once I heard about it in Fiesta. Stuck throttle from Janner was more like silly mistake, not a problem of the car.
I'm not trying to save Malcolm or something, just trying to be objective. I agree with Mirek that in general R5 class rules affect cars performance and reliability, but it's not that bad as some of you think. I know about few cars which done over 2,5k ss kms each and had no big problems, only one was terminal.
You have also to remember about one more thing - some of Fiestas are becoming older (in terms of ss kms), some done two years of rallying, some one full season. And at the beginning, when car is new, it is really reliable. And then it's how the car is prepared... and luck also of course...