The only thing that bothers me about Zed is the theme. It's so bland it actually gives me reading difficulties. I'd be surprised if some of the color combinations don't pose an accessibility issue. Grey text on grey background is quite the choice.
And the icons are too small. It's vaguely a mystery meat navigation.
As far as I can tell you can theme nearly everything in the app. I've got custom colors for diffs and some syntax, and my base theme is ripped from Monokai.
Cursor has the best default dark theme IMO
It also has a much better edit prediction model than Zed
Surprised no American forked it and called it Zee
But anyway, yes these bland names do annoy me. R, C, Go, etc. Have an opinionated name but especially, that's not hard to google
I do agree that Zed's default themes aren't great. They look too 'plain' for my taste. Bit more contrast can't hurt either.
BUT: It's very easy to just choose a different theme and there are plenty to choose from by now. It's even possible to make your own theme and they even have a first-party theme editor (https://zed.dev/theme-builder) which works great. They should maybe include some descriptions for each color instead of just the name but that's the only negative thing I can say right now.
I'd even say that it's easier to theme Zed than VSCode because there are fewer variables.