It's one of my favorite pieces of literature ever. I've read it partly in Dutch translation and the rest in English. Some time ago I discovered one of the books in a jumble shop, it was from 1919 if I remember well and in the original language. It made my day.
Anyway, it's difficult to say what exactly is the work of Proust. There is something of everything in it. Lovely descriptions (and I don't always like descriptions, quite often I don't read them, but Proust is wonderful), there is something religious in it, some philosophy, many interesting thoughts about life and people, why people behave the way they do, theories about the passing of time, various forms of art (painting, architecture, statues, etc.) the world viewed in ways you never thought possible. Some parts are almost like poetry.
It does lack speed and there isn't too much of a plot, but in this case, it doesn't even matter. The thoughts, the theories, the observations are too interesting to even think much about a plot.
Here are a few parts from the book:
It is our noticing them taht puts things in a room, our growing used to them that takes them away again and clears a space for us. Space there was none for me in my bedroom (mine in name only) at Balbec; (a hotel at the beach) it was full of things which did not know me, which flung back at me the distrustful look that I had cast at them, and, without taking any heed of my excistence, shewed that I was interrupting the course of theirs.
The main character tries to write, but it just doesn't work so he's disappointed and bored and thinks:
Perhaps some of the greatest masterpieces were written yawning.
While listening to a concert:
And, just as certain creatures are the last surviving testimony to a form of life which nature had discardd, I asked myself if music were not the unique example of what might have been - if there had not come the invention of language, the formation of words, the analysis of ideas - the means of communication between one spirit and another.
You probably noticed the very long sentenses as well. If I remember well, Proust has written the longest sentense ever in literary history.
If you like action, fast reads, only entertainment, then this isn't your type of book. Otherwise, it's amazing and any words fail to describe accurately the experience of reading the work of Proust.