Ronan is obnoxious

but he's the super cool 'alien' warrior who kicks as and takes names and is simply better than everyone else and just *beep* done cliche.

Obviously Teal'c wasn't available

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I love Ronan, he's manly, caring, strong and hot. Doctor McKay, I hate

Yes, Ronan is obnoxious and a terrible character for sure.

They tried way too hard in every single episode to make him look like a "cool tough guy." But the problem with that is that real cool tough guys never try hard to prove that they are cool tough guys. Hence, the writers'/producers' efforts backfire, and Ronan comes off as the wannabe poser that he truly is.

Ronan's true status of a pansy & a faker is also confirmed explicitly in the episode where he asks the lady doctor out on a date, she rejects him, and then he shamefully pretends that he didn't really ask her out on a date. Only a total loser - which Ronan here undoubtedly proves that he is - would do that.

Ford was a vastly better character and the Ford actor was also a much better actor than was the Ronan actor.

Having said all that, yes McKay is certainly still even more insufferable than is Ronan. But that doesn't make Ronan not annoying; it just makes Ronan not as annoying as is McKay.

"Science creates fictions to explain facts" – Gilman

What is a "ronan"?

Do you mean Ronon?

Ronon Dex is a sensible character, had a civilized life before it was taken away from him by the Wraith, and his experience fighting that newfound battle changed his state of mind. He lost his decency due to the Wraith. His involvement with the Atlantis expedition helped bring it back, but he was so damaged that it never fully came back. Be happy that we get at least a hybrid of his new self with his traumatized self.

His name was Ronon

Ronan was the only good character.

Ronon was an okay character. They just never did a damn thing with him, and he wasn't written very consistently. He was a bad ass when the plot needed it, he got his ass handed to him all over the place when the plot demanded it. He makes endless threats and never follows through on any of them. They put a little work into him at first and then just said screw it. The poster above mentioning how Ronon comes off as a bit of a fake poser is kind of right in my opinion, cause that's how he was written. Certainly wasn't Momoa's fault. When introduced, Ronon is basically Riddick at the start of Chronicles. Bad ass hunted across the galaxy who's become a master Wraith slayer. He should have been the backbone of the entire anti-Wraith storyline. And after he was betrayed and captured and broken and made to worship the Wraith, and then had to kick the affliction like a bad OD, Ronon should have hated the Wraith more than ever and finally killed them on sight no matter what. Instead, he becomes even more blase and false threats than ever. I would have treated Ronon like BA Baracus having to go on a plane. Total loose canon whenever the Wraith are involved. Anyhow, the whole cast was treated as supporting players to the Adventures of Rodney McKay, it doesn't really matter.