Yes, but it does depend on what you have, and what you want. Do you have an A/V set up just now?
Bang for buck they knock spots off a tv imo.
I paid 2k for 55inch Samsung tv with loads of crap I don't use. It's ok, nothing special. Sound is pants on it.
I only bought it because we moved into a rental for 18 months while looked for a bigger house, I couldn't hang the screen in the rental.
For the same, or depending on your haggling skills less money, you can buy a PJ, screen, receiver, and decent 5.1 speaker set.
Trust me, there is no comparison.
You don't need a huge or totally dark room anymore. Yes for movies the darker the better, but it's not essential.
Best bet is take an hour out your day and go to your local A/V dealer, I'm sure there'll be sevenoaks or richer sounds near you, and ask for a demo. Take a movie you're familiar with and ask them if you can view it.