Hooray, a Dong Zhuo debate! I like Dong Zhuo but I'll come back to that in a minute. I have to say first that I disagree entirely with the idea that Dong Zhuo had no value whatsoever. When Dong Zhuo came to power he undid a lot of the damage done by the Ten Regular Attendants like reinstating to office those that had been stripped of power. While those acts were admittedly designed to win the support of the people, it was still good work which carries merit.
As for why I like Dong Zhuo. For me, the guy was one of the most straightforward people of the whole era. He had no hidden agenda, he simply did what he wanted to and made no excuses for it. The man was asked to come to the capital in order to end the strife caused by the eunchs and to bring stability and that is what he did initially. The deposition of the Emperor is totally blown out of proportion because, let's face it, the wrong Emperor was on the throne in the first place! Emperor Ling wanted Xian to replace him but it was He Jin who convinced Yuan Shao to enter the palace with arms and forcibly have Bian (He Jin's nephew) made Emperor. Xian's mother had been poisoned by He Jin's sister and later He Jin poisoned Xian's adopted mother as ways of cementing their power. Therefore, Dong Zhuo simply undid another wrong.
Did the man flaunt the laws of the land while he was at the palace? Yes he did. Initially his guards carried arms while at the palace (made sense bearing in mind the turmoil that occured when he arrived) and later he took to wearing armour but only after an assassination attempt was made on him. Did he take the royal concubines as his own? Yes, and while that is frowned upon, please someone tell me what a nine year old boy is going to do with concubines? Other infractions of rules, I feel, can be often put down to Dong Zhuo's upbringing on the frontier.
Slaughtering people at the dinner table is another arguement made against Dong Zhuo. While this was admittedly unsettling, it was an effective way of ensuring that resistance against him was minimal.
Now let's get to the big one: moving the capital, buring the old one and grave robbing. Luoyang was not easily defendable and it made sense from a strategic point of view to relocate to the infinitely more defendable Chang'an. The account of him marching the people with him seems somewhat biased as later on, when Liu Bei marches a city full of people to Changban, it is told in an entirely different light. Burning the capital and emptying the graves of valuables are common sense to me. It simply does not make sense to allow a city that is in good working order and riches to fall into enemy hands. If the capital had not been burned, then the alliance would have had a good base to operate from and would enable them to lauch an all out attack on Dong Zhuo's forces and the people with him. Burning the capital resulted in the alliance staying put with only Cao Cao's army pursuing Dong Zhuo.
So there you have it.
"If you do not turn your back on me, I shall not on you." - Cao Cao to Pang De