I get what you say. Deo-D is certainly misused in the ladder, and its full potential can be seen in good tours. BUT this doesn't mean that i haven't faced players that used Deoxyd-D properly, and still i wasn't impressed. As i said already, i used Deoxys-D before on HO teams, and i think i used him right (my favourite set is Mental Herb + SR + Spikes + Taunt + T-Wave), but it never felt overwhelming. Maybe it was against scrubs, who didn't know what they were doing, or more unexperienced players in general, but against good players, he was handled ok by the opponent, and usuallly only got SR up, and maybe even paralyzed a poke before dying.
Part of the OU QC team, message
me for a check!