I know this post has been responded to, but I have a few more points.
By this criterion, there a lot of players who aren't better than Hawes. Greg Oden, for one. Michael Beasley and Derrick Rose, the presumptive 1/2 this year? Not better than Spencer Hawes. Basically, there's no weight behind this argument.
I haven't seen Thompson play, so I can't make any assessment of him, but the numbers quoted here aren't that impressive in comparison to Love. Love goes for 17/11/1 on a very talented team - a team poised to make a Final Four run - in a very talented conference. As a freshman. Thompson averages three more points and two more rebounds, but does it on a team where he's the main offensive option, and in a conference where he is the proverbial 'man among boys'. As a senior. I think given the context, Love's numbers are more impressive.
As far as being too small for the NBA, aside from Boozer and Randolph already mentioned, Elton Brand is 6'8". I mean, LISTED at 6'8". He hasn't had a lot of trouble rebounding or playing in the post. Now does Brand do what he does based on outstanding athleticism, or based on outstanding skill? I'd say that the latter outweighs the former. In the recent Stanford game, Love held the 7'0", athletic, probable top-4 pick Brook Lopez to 2 offensive rebounds while grabbing 5 offensive boards himself. I have faith that it will translate.
This, I don't understand. Arthur is listed (and from the looks of it, certainly is) an inch shorter and 50 pounds lighter than Love. Arthur is Ron Artest size, not big-time NBA post player size, and will probably end up a tweener. He's more athletic, I'll give him that, but I don't think he's anybody's answer at the 4 anymore than a Julian Wright, a Thaddeus Young, or an Al Thornton. He'll be a 3 and slot down when a team goes small. But of the potential franchise guys in this draft, I put Love way higher than Arthur. Love's probably not a franchise player, but he's got a better shot at it than Arthur.