Danny was hired in 2003 to oversee a franchise that hadn't won a championship in 17 years. in 4 years, the C's were champions. Danny didn't just build a one year champion, he built a 4-year contender. The C's were 1 quarter from another championship in 2010 and really could have won 3 straight with a healthy KG (2009) and healthy Perk (2010). The era was over in 2012 and Danny took the bull by the horns and traded his stars for future picks. Not sure how Danny could have done any better in a trade for PP/KG or how he could be closer to contention today than he is.
It is not a matter of cutting him some slack, it is all about the fact that there is no possible way that any GM would be doing any better than Danny is right now. I wish he'd put a worse roster together this season to get a higher pick, but he took the good deals available to him (including one that amounts to Doc Rivers for RJ Hunter and Brad Stevens) -- and ended up with a few more assets (picks, Zeller, Thomas, Crowder). And Brad Stevens appears to be a great NBA coach in the making.
After living through the on-going circus of ML Carr, Dave Gavitt, Chris Wallace and Rick Pitino and watching countless GMs across the league fail miserably during Danny's tenure, it baffles me that anyone would yearn for a change. But it's a 'what have you done for me lately' job. If Danny had traded 6 picks to get Justise Winslow, half the blog would be ecstatic and the other half furious.