For those familiar with Suzuki Mirano this is going to be the tame end of things, for other people, especially those who are just vanilla users the contents of Yume Kui are going to come as a shock. The story's nothing special, although I've given it points for creativity in sex placements, like having the scenario writer type the script while taking it from behind, or having the seiyuu record particularly realistic moaning lines--because she's being fucked at that moment. However points off for not really clearing up how he ends up enslaving all of the heroines at the end, I guess it's just anotherone of the "women just want dicks" cop-out we're all too used to.
The animation is superb though, easily at the top of the pool. The fluidity of motions and diverse angles is nothing short of the quality you'd come to expect from Suzuki Mirano. The voice acting is also very well done and captures all the pain, plight, anguish and pleasure experienced by the heroines.
Characters and character development is where this series falls short though, since the MC is never established to be anything other than a scheming fiend, and the heroines aren't shown as anything more than just different holes to screw. This makes the ensuing sex scenes less impactful since the viewer simply has no chance to build up a connection between the characters, however this poses few problems as the scenes are plenty impactful by themselves and retain much of their shock factor even when the effect is dulled a bit.
Overall while it's no masterpiece, definitely give it a try if you're not overly squeamish (which makes me question why you're watching hentai in the first place), or want to experience a change from all the vanilla you've been watching up until now.