The best aspects in Smite 2 so far:
Ra's Aspect: The aspect allows you to place your heal field on yourself or allies and lets you aim you ultimate while it is casting and heals your self and any allies in its path. The trade off is you lose the scaling on the heal field and the ultimate but if you are playing solo lane ra it is worth it as with the right build no one else can lane against it.
Mordred's Aspect: Allows you to use his dash after every ability that damages an enemy god at the cost of some damage it deals and the knnockup. This give mordred and insane amount of mobility that other gods with teleports or multiple leads/dashes can escape from.
Nemesis' Aspect: Changes her ult so that it is single target and loses % hp damage and instead makes the ultimate average the healthe between her and the target assuming her hp is lower. This allows her to fight until almost dead and then targeting the full hp tank ot someone elsee with high hp for a massive heal while they take massive damage.
The worst aspects:
1. Chaacs aspect is awful you lose what healing he has which helps him keep lane pressure and instead makes it do some slight ticking damage that is almost negated by hp5 (Yes I know technically its not hp5 in smite 2 anymore).
Loki's aspect is awful. You are trading out one of his main damage sources to make an ally invisible.