The people complaining about Doom Bots being "A sure loss" and thus "not fun" must be doing something wrong, I've beaten the DoomBot gauntlet twice (level 1->2->5) and haven't lost a single game.
Yes the doom bots are OP, but waveclear champs and split pushing make it incredibly easy, they are bots and don't prioritize well.
They also ignore pet aggro (AD Malz and AP Heimerdinger OP.), don't dodge skill shots beyond a certain range away (Ziggs and Lux can hit them around the edge of vision and the bots don't even try to dodge.)
Additionally they lack the focus to kill certain melee hyper carries (Yi, Aatrox, Fiora, Tryndamere.) resulting in these champs utterly destroying the bots in the mid-late game.
To summarize, it's fun to fight their OP AF abilities, but the AI is still so exploitable that the games are no match.
Humans still most OP.