Not necessarily, especially in the 1986 movie.
Optimus Prime: "One shall stand, one shall fall."
Megatron: "Why throw away your life so recklessly?"
Optimus Prime: "That is a question you should ask yourself, Megatron."
Megatron: "No! I will crush you with my bare hands!"
I absolutely loved the first one, but I thought Prime's personality in the first Tranformers movie (2007) was rather weak. I mean, aren't Prime and Megatron supposed to be even? Prime is just so much more bad ass in G1, but I guess they wanted to adjust Prime to fit in a certain way. Other than that, I fucking loved Transformers (07').