It’s a cute question. There are aesthetics to scripts. There has been a lot of aesthetic effort put in to the calligraphies and typographies of a lot of scripts.
In fact, when I was perusing Omniglot, to find something that jumped out as ugly, I realised that the obvious candidates were minority—one-off scripts of small communities, that never got the professional attention lavished on them that big-league scripts have had.
So Eskayan script, for example (Eskayan script and language) should not be targeted here. And having found an article about it: it doesn’t look anywhere near as ugly in notebooks in situ, as it does on the sample charts online.
The major Unicode script I happen to like least is Thaana (Thaana (Maldivian) script). But the reason for that, I think, is an Uncanny valley effect: it looks like it should be Arabic, but it isn’t. (In fact, it originated as a mix of Arabic and Indic numbers.)