Only thing I can tell you from that picture is the team on right should have a possession advantage because of 3 vs 2 in the middle.
As for the rest, based on your description, your opponent was probably using hard attacking, thus generating more shots with less accuracy. I'm further guessing the team on the right is yours, because only a substantial quality difference (you neglected to tell us how 'inferior' his team is.) should score 3 goals with that formation against 3 central defenders.
The team on the left effectively matched up 1 on 1 (attackers vs defenders) while the team on the right was effectively 1 vs 3 (attackers vs defenders). If the team on the left had moved a striker back to DMC or MC they'd have probably won easily.