Tom --
You have an excellent point! One should never "stereotype" a particular architect based on a few courses. I have experienced exactly what you say, where I played a few courses by an architect that I really did not care for, but they came up with others that were great. And think of all of the reasons for this, like architects evolving, changing their style to fit the land or charge, and greens committees that mess courses up!
I will admit, however, that I have some particular favorites, which is very helpful when you are going on a trip to someplace with a lot of courses -- it seems like it improves my chances of playing courses that I like.
Keeping things in the right spirit, however, whenever I am playing a number of times, I always make arrangements to play a few course by architects that I don't know or have not enjoyed, to give them another shot!
I will admit I almost asked for a tee time at Ted Robinson's Tuscany in Las Vegas...