Comparing patent trolling to genuine lawsuits is silly, AMD were a genuine victim of a decade or more of Intel illegally paying companies not to sell AMD products. It's completely illegal, utterly legitimate to sue a company over and they won. If AMD had billions in cash on hand and could have afforded the lawsuit.. they'd have won potentially $10billion or more off Intel in damages. The ridiculous nature of the law is Intel could afford to fight the court case till AMD was bankrupt, appealing the court, taking years and AMD literally didn't have the funds to pay lawyers for that long so they took a fraction of that in a settlement.
Similar to Creative vs.. Aureal is it(i forget the name specifically), they did some dodgy as hell things but had more money and in that case really did bankrupt the other company and "won" the battle via bankruptcy.
If you have more money then you don't have to be right to "win" a legal battle.