He may not have been depicted very well, but conceptually he was the coolest and most powerful villain in the movieverse. He could instantly transport himself from one location to another via space-bridge technology, and much more efficiently than Jetfire (recall that Jetfire and those whom he brought along would often materialize in the air and crash to the ground). He had telekinetic powers, being able to lift multiple, extremely heavy objects within a very large radial distance. His life span was far greater than that of an ordinary Transformer. He was impervious to attacks from ordinary Transformers. He was an original Prime. I don't think Megatron, Sentinel, Galvatron, or even Lockdown are as cool as he is conceptually. Perhaps they were depicted better than he was, but the ideas behind The Fallen's character are far greater that those of the aforementioned characters.