[quote=@Beloss]
in the Fate Setting Cuchulain was described as an average hero
[/quote]

what

He's literally one of the best Servants period and is first-rate even in a cast of all-stars, which is something he's maintained solidly for the past 12 years.

Even in FSN he's absurd. If it wasn't for Herc, he'd be a contender for the strongest Servant of that war. Gil excluded, of course.