You don't sound like a spoiled brat. Based on what I've read, it seems that you've done a lot of good work for your company even though they've chosen somebody less qualified for the position. I guess politics were involved and it just goes to show that hard work will not necessarily get you promoted.

Nonetheless it seemed that things worked out for the better: 30 % pay increase + (2/3) the work time; if you work out the math, your hourly rate has doubled :-D. It seems to me even though you weren't treated fairly at your previous company, you're the winner here.