No, there was a lot more to his Doctor than that. Generally, he was hitting multiple different notes simultaneously. And in no way did his performances share the faults of Tennant's performances. His Doctor was utterly different from Tennant's unconvincing lightweight Doctor. Eccleston is definitely the best Doctor after Tom Baker. And overall Eccleston's season was the best Doctor Who stuff ever made. High quality showmaking combined with a great Doctor and a good companion. Things dropped a good ways when they switched to Tennant.