I don't like bergenia, they look great in photos but in real life they have very big leaves full of slug holes which last all year, long after the flowers have died. Some look lovely in pictures but they're often just a not particularly nice mid-pink. There are some with nicer colours though and they apparently attract bees.
I share Fatoldlady's dislike of some daffodils, expecially the huge yellow ones, but rather like the smaller ones in cream and pale yellow with pretty cups.
Like Oreo I'm not that keen on grasses, unless they are in a particular type of garden, nor on the big old fashioned laurels.
I'm also gardening in containers now and finding I have to use very different plants and techniques.
In general I dislike any plant that is too big for the space it has to grow in. It means that it has to be pruned to keep it smaller than it wants to grow, which often spoils its natural shape. This is just as true of shrubs as of trees.