The Warriors fell far below the standard they reached in their win over Leicester eight days earlier as they lost out 38-17 at Thomond Park.
Speaking in today's Evening Times, Mark said: "We warmed up well, trained really well this week, so I think as a team we were in a good place. Why we didn't, who knows?
"It wasn't good enough at the start. We started the game poorly, and Munster really rose to the occasion and put us under a lot of pressure. Munster were outstanding, they really were. They came together as a team and performed on what was a great occasion for a great man. They put us to bed - as simple as that.
"I think we'll analyse it as we do every other game. There will be probably more learning in that game than there is in the games where it all clicks.
"We can look at where we went wrong and what we did to make it a bit easier for Munster, but we can also look at what Munster did so well to put us under so much pressure. We will really focus on taking what we can out of this one.
"Just now it's very emotional, so we're all absolutely devastated with it. But by Monday we can come into it and think rationally about the rugby: why it didn't happen. So it won't be as emotional then - it will be a case of 'This is what went wrong, this is why it happened', and being really analytical with where we go from there."