Oh, please, and Wreav being a stupid, archetypical Krogan brute isn't a chiclé? What a biased comment you wrote.
In any case, "mutants" like Wrex are the ones who precisely AREN'T the cliché, just because of their innate rarity. How many polite and patient krogan do you exactly see in the game, apart from Wrex (who deserves a ****** monument for his patience), Thax' assistant and Charr? If they're a cliché, then EVERYTHING about the krogan is a cliché (and thus you can also say that nothing is).
And yes, krogan may be violent, but that's why someone like Wrex is needed. And him being in charge is more an amazing achievement than anything else. I can't even imagine how tough it must have been for him, fighting against just about everyone to gain his sit in the throne, instead of everyone just agreeing to it like it probably happened with Wreav.
So yep, Wrex is probably the very example of krogan "anticliché".
No, friend, that's precisely the cliche. On a planet of hats, you get the one oddball who does something "different", the one who prefers thinking to the wars of his people.
In short, your post reads like that of a Wrex fanboy. Wreav is infinitely less of a cliche than Wrex, simply because the person Wreav is (a brutish, genocidal thug) is almost never given power, unless it is taken away from him. Stories about the mutant end with the mutant in charge and people being won over to his forceful personality.
Over the top. Boring, completely unrealistic. And cliche.
The dalatrass was indeed quite the straw man. Along with the forced "everything that happens to the asari is so bad", it was the forced "krogan are good and deserve a chance" feeling that really upset me about ME3. At the very least, with the krogan one, I can turn it into ruthless evil to ruthless but pragmatic evil.