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Eviolite Misdreavus also makes a great PerishTrapper with great special bulk if you invest in it allowing it to take out bulky waters in particular and CM Cune etc.
I use featherdance/taunt/roost/night shade on my Murkrow with most investment in special defence. With featherdance/taunt he can wall most physical attackers including stat uppers etc. It's pretty damn amazing I've got to say.
I did do some a few days ago and if Rhyperior has leftovers the difference is marginal at best. Personally, I think Rhyperior is still superior (no pun intended).
Not sure you can measure the length of the game just by how many places you revisit or how many routes there are. Heck in RBY you only revisit one place (Viridian) as well.
I don't necessarily disagree with you but I don't see how any of the 5th gen Pokemon are any less or more creative than Pokemon from the previous generations. I think it's more to do with each person's definition of what looks cool or imaginative.
You could catch Cryogonal in the other seasons it's just even rarer. It's weird seeing all these people talking about Winter when I've played through Autumn and Winter already and am onto a Spring playthrough now. It's like people don't know you can change the DS clock...