thing is nakamiie they didn't just up size every thing. In fact they made some mobs smaller. Granted the only examples i can give are Mitelings and Swarms.
Thank you for pointing that out, I'm glad they did make some monsters smaller.

http://i905.photobucket.com/albums/a...1302227600.jpg

This miteling is small, your argument is invalid (That was taken today)

In all seriousness though, I agree there should be diversity in size. Not everything needs to be the size of a large dog minimum.
Like I said, I just logged in today and from what I saw, it was terrifying, haha.
Hopefully, I'll be able to see small monsters soon too. (The big roseling are Lalafell eaters now, haha, I like that)

Yes, like you said, the minimum size shouldn't the size of a large dog.
And the problem of hitting small monsters is a targeting problem, not a monster size problem. Just make a circle fading through mobs to see the monster you are targetting when there is an army of them, problem solved.