You're crazy if you think Space Dandy as a whole isn't a great series, yes it had a few awkward episodes but it had far more massive hits then misses. Saying season 1 is a 4.5 / 10 is a complete joke when more then half of season 1's episodes are amazing. There are only 3 bad ones (1, 3, and 6) and the rest are at least good, and even the bad ones have scenes that are so beautifully animated it almost makes up for them (alien hunting on the strange planet in episode 1, giant robot vs monster fight epiosde 3, and surfing the destroyed planet episode 6).
Space Dandy is great because its great, Terror in Resonance is a show nobody would have given a fuck about if Wantabe's name hadn't been attached to it. Wantabe's name on space dandy let them have a bigger budget and let them experiment more which while it could be hit or miss it was still a crazy ride to sit though.
Edit: Just saw cowboy bebop 7.8/10 lol