Zen 1s are plenty fast. They're just not as fast as Zen 2s. The first generation 32 core Threadripper was the fastest CPU in the world when it was released, and that wasn't that long ago.
They are not very competitive for the price. They are about 50% slower than same-priced quad core Core i3 CPUs on Chrome Octane 2 benchmarks, 25% slower on video encoding, etc. AMD is free-riding the good reviews of their latest parts by giving these APUs very similar model numbers. In reality these are obsolete parts.
