You will see why he's more op than others:
1. He struggle to get he's power until now.
1.1 He kills monsters on daily basis unlike the side characters which only do raids every other day.
1.2 He trains every day, which give him additional stats (That OPM ref).
1.3 Also he IS a god (This was foreshadowed pretty early - the job change).
2. The rulers (gods) and monarchs are actually the reasons for everything.
2.1 The reasons for gates.
2.2 The reasons why he is op.
2.3 The reasons for every other mystery.
Also, if you could remember, the author didn't just dropped gods and angels just so he could fight stronger enemies.
EVERYTHING was FORESHADOWED at the earlier chapters (prologue/chap1-10? iirc).
ANGELS, the reasons for his "too OP" powers, etc. was at the earlier chapters just chillin and killing.