Shareef is soft, and a perennial loser for a reason. He's got nearly the winning pedigree of Tony Massenburg. We get him, we are again soft as butter, and really have nobody to blame but ourselves (or rather our front office). There comes a point when its not an accident, its not bad luck, and you're not a genius GM. You're somebody so fascinated with certain skill sets that you basically see the game "soft". Comes a point when the problem is that the GM and owners are effectively "soft", and that's why the team continues to struggle with it.
Reef differs from Walker in that Walker is kind of the wacky worst case scenario Kings PF -- the guy who has all the skills that we've had at that position, but has them in lesser degrees, is smallish, dumb, and disruptive to an offense. Reef is not as well fitted, but still has an applicable skillset on offense. He lacks the passing, but also is not as disruptive, beyond being selfish at times.
Thing is, this is what we lost when we lost the classic Webber -- in the entire NBA there were exactly two players who could do what he did at a championship level (the other being KG) -- we are such a high skill system, that we in essence almost DEMAND softness, we demand our PFs have the skills of a SF. Webb being a remarkably talented renaissance PF, he HAD those skills, but combined it with a big frame, athleticism, shotblocking, Top 10 rebounding etc. etc. Webb was never a "hard" player for a PF, but he was a physical force that was hard enough (albeit not by much) to launch us right to the very brink of a title. Now that he's gone, our choices are stark. We are stuck in either/or land -- either we get a player with Webb's skills, OR we get a full sized stud rebounder and shotblocker. But other than KG or some yet-to-blossom kid, nobody can be both for us.
And so Twoine and Reef both make "sense" on the either/or continuum. They are the soft SF side of the equation -- both guys have played SF in their careers, and in many ways basically are just blown up SFs. Good for their skill level, but not surprisingly resulting in them being two of the softest starting PFs in the league. We take them, they more or less fit into the system, but we are soft, small, and combined with the softness of Peja, Mike, Brad, just a speedbump to the top teams.