Mine is a 2000 model, so my vote of confidence for them might not be ideal since you're wanting a MK2 and mine's a very late spec MK1.
I've been very happy with mine. Not a very exciting drive, but very comfy and smooth and it more than feels its brief as a comfy cheap and reasonably economical daily driver.
My old boss had one of the MK2 Lagunas from new. Had a few niggles with it, but on the whole, for a car that did over 100k, little went wrong on it and it never broke down. The problems he had were stupid, such as the locking wheel nuts seizing and the electric valve cap things breaking off.
Jimmer on here has a 2003 diesel and he's been very happy with it.
Nice cars to drive too. Smooth, modern looking etc.
I've never been a huge fan of French cars, but have owned 3 and they've been pretty good to me. Although I did blow up my £75 Citroen BX on the M4! LOL