This was actually suggested by a Tony Zaffuto in the "Two Favorite Planes" thread:
My planes which gave me no joy would start with the Stanley #75 bull nose rabbet plane. The #90 is a better plane if just for the adjuster and lower angle. A bull nose shoulder/rabbet plane is not as useable as the longer nose shoulder planes.
Next would be a #18 block plane. For me the various standard angle block planes usually do not have an advantage over a bench plane or a low angle block plane.
A smaller block plane like a #102 or #103 are used because of their convenient sizes.
Who else has purchased a plane or two that doesn't really work out in their work?
jtk