I've no qualms with Nick McCarthy making the right decision for his career which this undoubtedly is. He's a good signing for Munster too as he's better than their options beyond Conor Murray (not including Alby Mathewson).
Serious question though, is there really nobody in Munster better than Nick McCarthy? Nothing against the player but he's hardly in the same class as, say, Tadhg Beirne, Joey Carbery or Andrew Conway. I'd hope serious questions are being asked about Munster's development of players if they're signing backup squad players instead of homegrown talent.
As said previously, I've nothing at all against Nick McCarthy and this isn't having a go at him as a player. It would be great if he kicked on and developed as a potential international in Munster.