I'd agree with you that it feels like it ought to be a crappy system, but out of curiosity, I just went and checked out my own profile. To my surprise, the "aggregate" of all of my 85 endorsements is fairly accurate. The top 5 are solid, and almost in the same order I'd rank them. There are a few which as you say, I wouldn't endorse myself for; but, only one of them made it to the top ten. I'd say that's not too bad since it a small sample. Maybe they don't need to change anything.