A great VA doesn't overwork the job needed to be done, i've heard a lot of VAs out there and they definitely sound naughty, but their way of doing the voice acting is kind of cringe at some point, moaning gets so loud, the way they read their dialogue is too obvious and i feel like the character just doesn't add up to the actual voice actress, since the VA has this more empowering feel than the character model itself, and i am talking about this in the perspective of looking out on studio fow's past works, at some point i do hope the VA does the job like they are BEING the character itself, and not OWNING them since there's a difference, a voice actor should always be flexible with the character's their doing the voice acting.
Just a quick example is the one voice acting the Sea King in One Punch Man's season 1, at around episode 6 or 8? where the Creatures of the Sea rises and wants to take over the surface, then there's the scenes with the Sea King, whoever's doing the voice acting is doing a damn good job, the moment someone hits him or he gets hit by a good punch or kick he grunts in pain like he's the one being beaten up WITH the character, its really good to know that at some point there are really great voice actors out there, and that there still some that are good, but cannot be compared to those that are really giving life to the character they are doing the voice acting with.