You know what, in Dominion and in many other competitive games (e.g. Hearthstone), I get more tilted by an opponent's good luck than my own bad luck.
If you think about your victory depending on your raw progress towards a victory condition minus your opponent's opposition of your progress, then an opponent having good luck appears as a more obvious, bigger "Minus" sign than your own bad luck giving you a smaller "Plus" sign. So for example, an opponent hitting me with Possession to steal a good hand of mine stings more than me stealing my opponent's poor hand with Possession.
I dunno, I can shrug off my own bad luck as "eh, it happens, but maybe next game I can get more done." However nothing makes me more likely to utter "are you serious!?" or some profanity under my breath than a opponent having multiple good turns in a row (edit: but like, if that string of good turns was a very unlikely event and not just the roughly expected outcome because of deck composition).