Folks without issues typically won't find the thread or post.
I have an early 2014 rMBP and a recent Mini (2012 model) both running Mavericks. I also had a early 2013 rMBP and my experience was similar.
I've heavily used two $12 Ornico USB3 and a $24 Startec USB3 enclosure with both rotational and SSD for 6 months now without connection or sleep issues. I have had an OWC envoy USB3 enclosure for over a year that has been issueless. I've been using two Seagate 4TB backup plus USB3 drives for a year as well as two HGST HGTBDX34 4TB Touro Desk DX3. I have a couple year old Newertech Guardian USB3 that has never been a problem. The Newer Voyager S3 has been flawless. I had one HGST drive failure but otherwise connections, sleep, data transfer has not been an issue. I used a Belkin USB3 hub for awhile but found it caused more sleep and wake problems than it was worth. I also experience a couple flakey cables. Recently I installed a Startech Thunderbolt dock and connect my less portable USB3 drives to it. My portables are still using the rMBP ports.
The original Startech enclosure experienced a failure and was replaced under warranty, the Oricos needed a firmware update to disable sleep before they would work well with my rMPB, ACER windows 7 box, or UNIX machine.
"StarTech.com 2.5-Inch USB 3.0 External SATA III SSD Hard Drive Enclosure with UASP Portable External USB HDD and Tool-Less Installation (S2510BPU33)"
"Tool Free Screw-Less ORICO 2588US3 USB 3.0 2.5-inch SATA External Hard Drive Enclosure Adapter Case for HDD SSD SATA Drive - Blue"
I've had issues with rMBP sleep only with a LG display port monitor. That was corrected after I inserted a TB LaCie RAID between the monitor and rMBP. Seems like TB devices can clean up that interface too

There was one of the Mavericks dot releases that broke the wake function, but the next dot release fixed it.
It does seem to me that both ML and Mavericks have more of these nagging issues since than just about any OS since 8.6. My MacPro running 10.6 just works... then its only USB2, firewire and eSATA. USB2 was a lot simpler than USB3. Perhaps Apple is not devoting as much development time, or they were sold a development environment that turns out to have plenty of issues.