I think Blyleven's carrer is underrated for a lot of the same reasons Evans was: (a) he never played for a big market team in his prime, (b) his career was broken up into multiple parts with different teams, (c) his teams weren't, in general, well covered or good, (d) he wasn't notably glib or colorful, (e) he didn't post huge won-loss records that make people pay attention that otherwise wouldn't