My experience is completely different. In Chicago, we literally have 50+ of these things deployed all over the city, all at 6/1 speed tiers. We regularly get 10mb down (well above our bandwidth tier), and always get at least 1mb up. Latency is anywhere from 50-100ms to most hops; it could be better, but Clear is somewhat nacent and I hear they're focusing more on raw bandwidth than latency (apparently with 4G you can approach the latency of wired services). We've had these units in place for about 7 months now, both as primary and out of band connections - we really couldn't be happier. The only thing that could be improved upon is the lack of NAT control on the devices they currently use.
I have a feeling that wherever you are, the backhauls are completely overloaded. This actually happened to a couple of our POPs - one in particular was only getting 1/1 and was getting daily dis-associations from the WiMax tower sometime between 1 and 3AM for about 20 seconds. Customer service was unbelievably accommodating though - they said that work was being done on the tower that particular POP was associating with, and that we wouldn't be charged AT ALL until the tower work was verified complete and our connection was stable. Basically we had an ok and usable connection for free, and when whatever work was completed, we knew right away - the bandwidth jumped up to right where the other POPs were. Consider me impressed with their customer service, to which I'm normally used to horrible, horrible experiences.