Is it worth buying a projector and screen to TV, PC, and Netflix etc?

I have been looking at cheaper projectors and they seem reasonable for small homes (short projection distance/large screen) but vary in lumens and resolution.

not too sure what I need but don t have a large living room. Any thoughts or help welcome.
Update: I should say that I am in the UK and have a 42" Sony 1080p smart 3D TV which I link to my computer at the moment.
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