I always thought deoxys d is terrible. I guess he can spike and stall, which no one else can do, but as a wall he is no different from forretress or ferrothorn. He can only stall certain pokemon so maybe he's good on super-stall teams that have his weaknesses covered.
I don't think bw2 was kind to him now that genesect is around. Suicide-lead DeoD is useless now.