Interesting that you say Blake is useless. I'm certainly no expert but have heard opinions where weather issues aside (water seeping in through the stitching holes), that Blake/Blake rapid is of no inferior construction than Goodyear. As pointed out, Blake does offer the ability to make sleeker looking footwear.
Could you expand on why you think Blake is "useless"?
The Blake stitch is definitely inferior to a welted shoe for the reasons you just mentioned. Essentially, you have a shoe that bears all the problems I described in my post from earlier today when Munky asked about cemented shoes. The only difference being that the stitching will prevent the sole from falling off over time. However, the rest of the construction between a Blake and a cemented shoe are much the same. When the sole is taken off, there isn't anything holding the shoe together. This can open up a real can of worms when repairing a shoe.
A Blake/Rapid, however, is probably near equal with a Goodyear-welt in my opinion, but I would still go with Goodyear generally. There are pros and cons to both, but I think the scale tips in the Goodyear-welted's favor. Blake/Rapid shoes almost always use fiberboard insoles rather than good quality leather ones, unless you are buying the obscenely expensive ones (in which case I'd just put my money towards a hand-welted shoe). With Blake/Rapid, you still have the annoying stitches inside the shoes that your toes can feel. Also, if you tend to wear into the welt on your welted shoes and thus into the midsole on Blake/Rapid shoes, then when it comes to resoling, you really aren't saving the uppers from any more wear and tear during the recrafting process by going with Blake/Rapid. In other words, if they are replacing the midsole on your shoes at each resoling, the uppers and insole will only withstand this for so many occurrences before it's integrity is shot, just like a Goodyear-welted shoe when replacing the welt. However, with a Goodyear-welted shoe, only the upper is taking a beating during recrafting, while with Blake/Rapid, both the insole and upper are. Finally, if you are looking for a flexible shoe, then a Blake/Rapid is a bit stiffer than a single sole Goodyear-welted one. A Blake/Rapid is closer to a double soled Goodyear-welted shoe in regards to stiffness.