The extant differences are not universally thought to be so great as to warrant the dramatically greater public acceptance and promotion that prescription drugs receive in the US. This is not aided by the fact that methamphetamine is itself an FDA-approved treatment for ADHD (http://www.drugs.com/pro/desoxyn.html).
I would agree that "basically just meth" may not be the best way to say describe this, though, as it's only as true as saying they're entirely unlike meth.
