Played him the other day and he felt like he'd lost a lot of his slipperiness.
Rat at this point is teetering on the edge of balance, all he can really be looked at is his ultimate and damage. Any utility outside of that is either weak to the point that it might as well be nonexistent, which begs the almighty question of "Why is it still there then?".
Any direct damage nerfs at this point is going to make him next to useless because his utility is too weak.