The only thing I remember is somebody saying that they overheard a conversation of Citroen dealers saying that the C5 was the most unreliable car they had ever sold, something like 50% coming back with gremlins.
I was a passenger in a (hired) Pug 407 just after it came out. I commented to the driver "rubbish quality these French cars", poked the radio surround and it popped out and fell onto the floor!
I've just looked at the Top Gear survey from 2004 and the 10 most unreliable cars are:
http://www.bbc.co.uk/topgear/survey/unreliable.shtml
Citroen C3 (133rd)
VW Polo (New) (134th)
Citroen Xsara (135th)
Citroen C5 (136th)
Fiat Stilo (137th)
Renault Megane (New) (138th)
Mercedes M-Class (139th)
Peugeot 307 (140th)
Renault Laguna (141st)
Renault Espace (142nd)
So..... possibly as a company car it wouldn't make too much difference, but I wouldn't get one as a reliable daily driver.
Gareth