I guess MoI can't be compared with other modelers because it is still in beta stage or at least in pre-release stage... All other modelers mentioned have version numbers bigger than 2.0
Since MoI is still young, and some basic tools missing it is easy to find advantages for other programs... I believe that MoI 3.0 will be a best seller and Michael will be hired from AutoDesk and MoI will be Autodesk's "Modeling Inspiration" :-)

Seriously, MoI is something NEW.
I had no idea what NURBS modeling was, I am an engineer using CAD for 19 years and now that CAD is transforming to BIM (Building Information Modeling) for architecture I see that I need a new, fast, easy and powerful modeler. I am sure that this will be MoI.
The same happened with renderers... From simple scanline, to Vray, to Maxwell...
This is what always happens...
From pencil to computer to virtual reality...
From horses to cars to airplanes...
etc.

Moi is probably most similar to Rhino, since Michael is the Father Of Rhino and Moi has most of the basic functionality of Rhino. The mesher is already better than Rhino's and I like Michael's guides better than Rhino's smartTrack. Moi is much more forgiving, too.
I haven't had much time to play with Moi lately, but I'm definitely planning on buying.
I'm really excited to see what Moi will turn into. I know if Michael Gibson is involved, it will be very cool.