Unexpert response:
- projectors don't produce as good a picture as tv - don't know, but I bet it's as subjective as even comparing good and bad tv's. Good projectors can produce a fantastic picture. I rate my projector (Infocus X9) above any tv i've owned, but maybe i've only had bad tv's!
- projectors are noisy - but not unbearable, I can put up with mine no probs, don't really notice it when actually watching movies.
- projectors need a lot of room - not really, I use mine in a living room roughly 3x4m, picture size 75inch or so diagonal.
- projectors don't have multiple inputs - not an issue as I only have one thing plugged in at a time anyway, but I have one HDMI, and composite which is enough, and some others too. Other people might need 3 or 4 HDMI inputs, in which case this is an issue!
I love having a projector, even if it is only 720p not full HD, I can't stand going round to friends houses to watch films on a small tv's, and would much rather have people round mine instead!!! Wouldn't be without one now! Hope you get your expert comparison soon!
edit: you just got the expert response while I was writing mine!