Hyacinths are rather ugly, I will agree.
I think the crux of the matter for me, is not the actual plant but how its used.
I cannot stand all bedding arrangements although bedding has its place and those of older generation took much pride in landingstrips of brightly coloured non-hardy vegetation.
My pet hate is gaps, as was the requirement in the 50s and 60s when showing off single specimens was the done thing whilst I'm also too much the control freak to let things run loose and flop everywhere in an unsightly manner. No no no.
I like lush but controlled. I like shape and form, foliage and texture over colour and perhaps find plant combinations most difficult when having to consider flowering colours and seasons. I mean, my sofa only has to match the wallpaper and it stays the same colour and doesn't grow or need any pruning or maintenance and will never die on me just because we had a wet winter!!
I need a lie down now.