Loki Deals Too Much Damage

Arachne: magi's blessing, unlike other items, is perfectly viable on all gods. That said, cooldown reduction does put a damper on this. But in the early game though, you are literally helpless no matter what you do; she can easily win 2v1s with Drain Life and her Spiderlings. She does fall off quite hard, so simply outlasting her and surviving the laning phase can help.

Bakasura: I'm told that Greater Sprint + escape ability works well, although it does rely on having an escape to use. Overall, not much you can do, especially in the early game. Late game, outplaying his team works, although this is just like Loki and solo queue. What happens most of them time is him being fed and then killing everyone and everything no matter what they build.

Bastet: Early game, there is literally nothing you can do about her cats. They will chase you into tower and deal over half your health in damage, and they WILL outspeed you. Late game, Bastet tends to do poop damage regardless, so I guess simply outwaiting her is an option, unlike pretty much every other assassin.

Fenrir: No matter what stage of the game you are in, no matter how fed he is, everything stops Brutalize.

Hun Batz: Beads or ult his ult, at least in the laning phase, then escape away. Alternatively, Greater Aegis helps. Otherwise, late game, there's not much you can do, as a competent Batz may be able to land only 1/3 ults, but a teamfight where he does land his ult is practically a guarenteed win. His ult also has nearly no delay which is extremely obnoxious. In addition, RNGjesus plays a huge part in this guy's viability, also complicating things.

Kali: If fed, you lose. Period. Whether it's teamfights or duels or early or late game or 5v1 fights, you lose, because the ability to rip apart tanks then get healed by them is a completely balanced passive.

Mercury: Congrats, you got oneshot by a single basic attack, because 375% of AD in one basic is totes balanced. Funnily enough, it eclipses Loki's scalings. The one good thing is that he has to get close to you, but it hardly matters as he is freaking Mercury, with two gap closers and some of the best CC in the game. This is the guy who can gank at level 2. Early game, he will be unjukable, late game, one lucky hit will end you. He's pretty damn uncounterable.

Ne Zha: If fed, he will ult you repeatedly, and win, because his ult is another totally balanced ability. The funny part is, his ultimate - basically a banish combined with a chunk of damage - is nothing new in MOBAs, but no other MOBA made the banish deal this amount of damage before. You can't beads or aegis his ult, outside of having obscene reaction times. Teamfights? He'll ult you. Duels? He'll ult you. Sitting in tower? He'll ult you, and your opposing laners will be waiting for you. His ult is just awful.

Nemesis: Buy sprint. Not much you can do otherwise, as you obviously can't outduel her and if fed her shield will probably grant more health than any of your abilities can damage.

Thanatos: If fed, you die in the laning phase. He will oneshot you with his ult-in-spam-abilities combo. Late game, it's possible to exploit his lack of gap closer; healing also counters his ult magnificently. He's basically Arachne, only slightly better.

Thor: Depends on whether or not you can see his ult coming. He also actually doesn't deal too much damage without a few basics and his hammer throw, so Aegis works pretty well against his initial burst, then his need to use his escape to finish you off can be exploited. That said, a fed Thor is still an uncounterable POS as the above restriction barely limits him, not to mention the horrors of him getting cooldown reduction.