That's not out of line with what I've seen over the years though. Unless a thumbdrive quotes sustained write speeds in the specs, it's gonna suck. Massively. I've had drives that claimed to be USB 3.0 that didn't even come close to saturating a USB 2.0 interface, and USB 2.0 drives that barely pushed the limits of USB 1.x.
As far as the connector design goes, I've seen similar ones on other thumbdrives; the "half plug" thing isn't that uncommon. Pin 4 (at the bottom in your pic) is ground, so having a grounded shell isn't electrically
necessary, though it probably provides some additional ESD protection when the drive is being transported and plugged in.
Verbatim sells a line of thumbdrives called "Clip-It" that have an even more minimalist connector than that:
While I wondered about the lack of ESD protection, I've been using them for several years and have yet to have one fail (the above pic is of one I just happened to have at my desk). The thin form factor makes them perfect for putting in your pocket or wallet. I use them for sneakernetting small files around and bootable ISOs (where they're essentially treated as read-only once you've written them, so slow writes aren't much of an issue).
Edit: Also, whether you've got "optimize for quick removal" set for that drive in Windows can make a big difference for thumbdrives. Disabling the Windows file cache (which is what that option does) imposes a severe write performance penalty, and since you're dealing with a device with sucky write performance to begin with...