This is why we keep such a range of loudspeakers. Everyone is different, and we all have our pwn preferences.
How a speaker will ultimately sound will depend on many things - your room being one, and your system being another. If the amplifier isn't sufficient for the speakers, the speakers will not perform to the standard that they have been designed to. As mentioned, stands are another factor, and can in some instances change a speaker's sound quite dramatically. Let's also not forget that how we perceive a product is influenced by what we are used to at home. As an example, those who have lived with large speakers, or particularly bass heavy ones, can take an instant dislike to smaller speakers. The same can be said of those who own smaller speakers - they tend to find larger speakers boomy and bass heavy.
The LS50's bass isn't going to be the deepest around - let's face it, it is a 5.25" driver, and as far as radiating area is concerned, you can take away the area taken up by the HF unit, so it is actually less than 5". It is a small cabinet, with a lot of bracing inside, reducing the internal cabinet volume. I usually find a little understanding of a how a product works or has been designed, helps to appreciate what they do right, rather than just dismissing them on a quick listen (in unfamiliar surroundings, unfamiliar system, and sometimes even unfamiliar source material).
I think a few more details from Tacty regarding the venue and accompanying system might help things