Regirock's not bad, it's just outclassed. Base 100 Atk is respectable, but when most of your EVs are invested to make you a wall, you lose out on the same offense (and, naturally, speed) that Aerodactyl and and Tyranitar get without needing to Curse. On defense, it's a super solid wall, but you don't really get any utility out of it, except maybe Thunder Wave. Skarmory and Forretress, on the other hand, can Spike, Roar/Whirlwind, and Rapid Spin, respectively and be more useful in the long run. Unless you're putting in work to clear out Regirock's obstacles (like Suicune, Swampert, or even Skarmory) beforehand, you're inevitably looking to take out those same obstacles for someone else on your team via Curse + Explosion.
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