people are mostly judging lev based on their game against NRG and you said it yourself, NRG look like the worst super team. they have no strats other than playing contact every round and lev perfectly read them since they're extremely one dimensional. lev's players (in particular mazino in this case) were also shooting far better than they NORMALLY do.
if you look at lev's other games where the opposite team actually had some strats they didn't perform as well and their win against sen was off aspas breaking the kill record and they still barely managed it (the same sen who just recently lost to EG btw). I think NRG will surpass them in time since they'll become comfortable on their roles and develop some ACTUAL strats that aren't "let's walk together and hope for the best". now I'm not saying teams can't improve but it's delusional to think lev just magically became amazing in a week. anyway my point is that they won't keep up this form for long, other teams will improve and similar to NRG, they have no actual igl + arguably less experience along with the language barrier
KRU's set plays have looked very convincing, and the heat/keznit duo has meshed very well. they've only beaten bottom teams so far but from what I've seen I think they can definitely compete at the top, they're not like NRG who are just aim-diffing their opponents, they have good strats too