I'm surprised to see how Irish fans here seem to dismiss their own team's chances.
For me Ireland vs Wales has been the best match from far in that first tournament round.
And that was not just because of Wales...several very good moves from both sides. The only weak point was...the referee, that has been IMHO too laxist about rucks.
Don't know who will be the one for this match but this may be the key as Ireland is much "better" on that aspect than France.
On french side the big disappointment was line out, maybe selecting Maestri from the beginning will help but we're going to face the best team of the tournament also in that exercize so...
Whatever will be the winner I would bet for a very narrow margin and the referee will have some influence anyways as ever in that kind of situation...
I will also look at the scrums, it becomes more and more difficult to figure out why some team get penalized sometimes.