There's always better teams. Same thing happens in the NFL, just ask the Patriots who've had perfect season that didn't lead to championships.I thought there were better teams (based on the always correct eye test), but I can not say ND should have been left out based on their record and schedule (which is something UCF lacked).
The issue is that you need to earn your way in, something that Notre Dame definitely did, and Georgia did not. I say this being raised a Dawg fan and as someone who hates Notre Dame.