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Re: guaranteed bandwidth.
PCIe 3.0 is 8Gbps per lane each way. On a x16 GPU slot, that's 128Gbps both ways; enough to accommodate 100GbE. This slot is standard in most PCs using an i5-3xxx or i7-3xxx CPU.
Lower-end PCs using i5/i7-2xxx CPUs or Celeron/Pentium/i3 only have PCIe 2.x which limits their x16 bandwidth to 80Gbps.
USB3 can do up to 5Gbps, which is already more than twice as fast as this up-to-2Gbps service.
So, in terms of PC connectivity, 2Gbps is not particularly fast but it is twice as fast as the ubiquitous 1GbE NICs.