So I'm not sure about everyone else, but in my experience, Razorgors are generally not at all worth bringing. Which is a shame! Because honestly, they're a really cool unit, that in theory should provide the Beastmen with a hard-hitting AP unit more akin to heavy cavalry than Centigors.
Problem is, they just don't seem worth it.
One of the big issues I've noticed with them, is that they're really bad in prolonged combat due to their low melee attack (and defence), so you need to rely on their charge to deal most of the damage, which I'd say is one of their biggest strengths. The problem is that they rampage, meaning chances are you won't be able to pull them out, and even if you do, there'll often be one or two that don't pull out (though to be fair, that doesn't seem specific to them), so they'll stick around in melee combat where they'll get butchered because of their low melee defence.
Personally, what I'd like to see done is to have rampage removed and their melee attack increased, alongside a buff to their health and potentially defence, alongside to a cost increase to make them more of a high tier option than a 600 gold unit. Though honestly, regardless of how they're changed, I just want them to be good, because there are no other Beastmen units like them, and frankly, an army roster that is missing some of its coolest units doesn't need to have its options cut short by a unit that is just not worth using.
If anyone else has thoughts on the state of Razorgors, I'd love ot hear them! I'm definitely not an amazing player and what I've stated are just my own observations on the matter.