Should we ever have expected a 2017 $300 tablet to emulate PS2?ITT: Off topic fear mongering of Switch OC'ing. Nice. Never change, temp.
On topic: Don't expect the Switch to ever emulate a fair majority of PS2 games at full speed. You might get close, but chances are you'll see hiccups out the wazoo. The joys of Ninty underclocking an outdated chipset.