Wouldn't agree at all. Fintan, in particular, can be very critical and a bit of a perfectionist. He was very harsh on Conor McPherson's "Shining City" which was a brilliant play and had been very well received in London where it premiered. Indeed, the reason for the London premiere was that McPherson said that the Irish critics couldn't be relied upon to give it a fair crack of the whip and one bad review from a mainstream Dublin critic could "sink" a play.
You also have to bear in mind that Dublin is a small city and personal agendas can come out in (some) reviews! Otherwise, criticism tends to be pretty fair. Bernard Farrell's last play got a terrible slating from nearly all the critics (deservedly so IMHO) although in fairness, it never claimed to be more than a light-hearted romp.
My main criticism of the critics is that sometimes there is a tendency to give an easy ride to avant garde or experimental theatre - there is a lot of rubbish about and sometimes pure crap is just that and the emperor needs to be told firmly that he has no clothes! On the other hand, there is a tendency to be over-critical of the Abbey/Gate practise of putting on crowd pleasing productions of the old reliable favourites, no matter how polished the performances may be. Perhaps the critics need to feel superior to the audiences??