IMHO, that iMac is the ugliest Mac probably since the iBook G3 clamshell. It's even uglier than the G5 iMac and its Intel-powered polycarbonate brethren. Heck, I can't think of any Apple products in general that look worse than this made in this millennium.
And it goes even beyond the white bezels (which I always hated on smartphones back while they still had those) and the unnecessary chin: most monitors nowadays have the I/O on the side, why does this have everything at the back? At least it doesn't charge from the bottom, unlike a certain pointing device...
There are a few nice touches like the power cable, the internal design, the TouchID finally being introduced on the Magic Keyboard and the colours. But as a general package, I have mixed feelings.
I could go on about the line-up and pricing as well, but I'm still waiting for the M1X chip (or whatever it'll be called) and the larger-size iMac. Not planning on buying either of those, but they'll be paving the way for some future Apple Silicon-powered Macs, one of which might become my next computer.
Overall, I'm not exactly disappointed, but I don't like it either.