Well, Drax started as Arthur Douglas. His life took a horrible turn when Ronan attacked his family. After that, he became Drax. His whole existence now revolves around getting revenge on Ronan. His new form gives him the physical capabilities to take on powerful foes like Ronan. He's a very straightforward character in that sense, driven by this single - minded goal.
In the comics, Drax is not dumb. He may not be the most sophisticated character, but he has his own kind of wisdom and skills that help him in battles and adventures.
Overall, Drax is quite strong in the comics. He can go toe-to-toe with many powerful villains. His physical abilities and combat skills give him an edge in battles. Plus, his determination and drive to fight for justice add to his strength.