My experience with the USPS has been mostly very good.... and MUCH better than UPS... So, I don't think it's odd at all.
It's expensive to ship heavy or large objects... Generally, anything I ship up to 5 lbs. goes USPS. I feel confident it'll get there safely.... anywhere in the world. The few times I've shipped to Australia, it's cost me about 1/3rd or less of what UPS would cost. One time it took 3 or 4 weeks to get there, the other it took maybe 1. However, I think the problem could have VERY easily been Australia's postal system.
Also, the packages I've received are in good shape... they haven't been thrown, sat on, or used as a jack stand when the delivery vehicle had a flat tire..

(all of which I've received from UPS)
I haven't shipped with FedEx, only received... and all of those shipments have been good. I've used UPS a lot more than any other so, I have a bigger sample of experiences. UPS is about 80% certain to get the package to its destination undamaged. With my smaller samples of FedEx and USPS, it's about 100% and 99% respectively.