Tbh i don't consider Aspect or CC overpowered at all.
Aspect turns an enemy into a 3/3 which equals 6 face damage. Turning it into a 3/3 means two things. 1. As the Vanar player you still have a serious issue to deal with -> you have to trade in further cards/mana/health to remove the minion. 2. There is no point using fox on most 2 or 3 drops, it's a dead card in the early and only really useful later on against fat shit. Yes it gets better the bigger it's target is but given the downsides it has i find that pretty fair.
CC is even less of a problem. 2 damage and a dispel is nice but again it's not solving any problems on it's own. So you CCd an Aymara. Good for you. But there is still a 5/3 standing in your face. Its decent against understated support minions like Kelaino but that's pretty much it.
If there is a card in Vanar right now that I think is problematic then it's Mana death grip. Ping + permanent Manaboost for 1 mana is a bit too much. Giving Vanar ramp is ok, it allows them to play control and speed up their win cons. But such a strong effect for so little mana is a bit too generous, especially when combined with Circulus. Normally MDG would have the "down side" of burning cards very fast. With Circulus this weakness is gone completely. Maybe both cards on their own would be ok, but giving Vanar both is crazy.
They should either up MDG to 2 Mana or remove the ping. The card would still be absolutely playable. People have been playing chrystal whisp before MDG was introduced and that card is far worse than a 2 Mana MDG would be.