User blog comment:The Dragon Demands/Slapping Joffrey compilation (set to "Sweet Dreams are Made of These")/@comment-5180349-20120609102343

She thinks that she deserves true love, unassailable power and unconditional respect, but is delusional in her belief that she'll earn these through fear and abuses of power. She doesnt understand that with power comes responsibility and that her actions have consequences. She also never realizes that people do not come to her or respect her commands because she is an ineffectual leader, and a very poor ruler, with bad judgement and little patience for the tedium of leadership. She is also very vindictive and repays slights against her no matter how small in ways that are often more extreme and nastier than the slight itself.

In a scene in Season 2 Ep 9 "Blackwater" she orders a member of the Kingsguard to have a groom and two maids executed for stealing a horse and two gold cups, meanwhile t100,000 men led by Stannis Baratheon are laying siege to the city. This scen is an example of her ruthless and irrational decision making. And then she turns around and says to Sansa:

"The only way to keep the small folk loyal is to make certain they fear you more than the enemy".. She desires power but doesnt know how to wield it. This recklessness combined with her sense of entitlement makes her a tyrant. Although she's far more subtle than Joffrey is.