Personally, I think getting swept by a crappy team that is on a pace to lose 120 games is way worse than losing streaks. There may be a reason for a losing streak (i.e., stretch of games vs over .500 teams or maybe 1-run luck is regressing).
But to lose to some random starting pitcher with a 7.94 ERA, who started the game at 78% and he outpitches your 100% stud pitcher is maddening. It's like you have AK vs opponent's AQ, flopping AKx, getting all the chips in the middle, turn Jack, river ten.