Ohey, this is kind of a tall order. But I'll give it a go, I'll rank them by blade feel and provide some comparisons to other well known razors.
The MJ-90 with the standard base plate. This combo is extremely mild, there really is no blade feel to speak of and efficiency of a Gillette adjustable on 1. I cannot (while using good, no pressure, technique) get a BBS shave out of this combo, even with ATG buffing.
The Baby Smooth. A tiny bit more blade feel here, much like a Gillette adjustable on 2 or perhaps a blue tip or a later black handle SS. The magic sauce with the Baby smooth is that it forces a very shallow blade angle. I'm pretty sure that I could do 5 passes with the BS and not feel any irritation, luckily I only need 3 passes to get the job done.
The Mamba. A little bit more blade feel then the BS but still very mild. Maybe 3-4 on the Adjustable or a regular Flare tip SS. Similar head geometry as the BS but offers a little wider angle window.
The Mentor. This is the same head as the Maggard V3A and is sold under many a house brand. Similar in blade feel to a Merkur 34c or an R89 but offers a slightly larger angle window to play with. If you are really paying attention you can feel the edge of the blade but it doesn't feel like it will bite at all.
The Game Changer, this is perhaps the sweet spot on the RazoRock lineup in regards to blade feel. With the exception of the Baby Smooth I tend to prefer razors with a little more blade feel. Similar to a Gillette NEW or a Fatboy on 6. Just enough blade feel to let you know its there and its cutting. I made the comparison on another thread that the GC has the smoothness of an Aristocrat with the efficiency of NEW and I still think that's a pretty fair assessment. One thing to note about the GC is that it very rigidly holds the blade in place due to wide support bands, borrowing this image from Gus
@Str8on2
http://theshaveden.com/forums/threads/razorock-gamechanger-first-shave-prototype-head.58790/ :
and the MJ-90 Aggressive base plate. A little more blade feel then the GC but perhaps a bit less smooth. Doesn't benefit from the full bottom blade support, a little bit of chatter can be detectable at times. Blade feel somewhere in the neighborhood of an E3 Injector or a Gillette Old type.
Hope someone finds this helpful. Remember this are my impressions, YMMV

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