I'm not going to even try to argue what ratings means if you don't understand their significance. Clearly everyone in the top 100 got their by random chance, pure blind luck. Clearly.
Your perception about what is prestigious is really odd and off-base. I don't even know how the scoring works for Deep Dungeon but I think you must know what you're doing if you're #1, congrats. But maybe you don't, maybe you got their by random chance, pure blind luck.
This conversation has already been had elsewhere, where non-competitive players begged for ranked Feast rewards. I'm sure you know about it and how both PVPers and non-PVPers feel about removing exclusivity.