You just answered your own question

Mostly.
Yes but it's also possible for that to go the other way, and ultimately that is just the mood you're in when watching a film, it doesn't change how good the film is and if everyone else hates it you might decided it's poo even though had you watched it on your own you may have loved it.
Ultimately that opinion for me is mostly because I prefer watching films at home when I'm alone, quieter, no distractions, gets paused only when I need food/slash. You can watch a film with multiple people at home as well... hard pushed to fit 500+ people into most peoples home cinema, but it happens with far less people as well.
GLaucus all of that is fine however, my living room is very easily able to be made pitch black and silent, and I can wear quality headphones. In a cinema I've had multiple films ruined by kids, or loud adults, food munching, packet rustling, etc, etc. I've very rarely been to a film where I haven't been irked by at least someones noise. Also the having a pee potentially ruining a £8 film because you don't know when the best time to take a slash is... really gets to me.
For every upside there is a downside, but again the film itself doesn't change for me. Again most of these can happen at home too, my parents are horrendous at watching anything without fidgeting, talking, stopping for food, moving around.
Great headphones or decent speakers, a high quality 1080p screen and ability to control conditions at home for me lead to the better experience 99% of the time. In terms of big screen, meh, you're also likely to be miles further away from it. I get less distracted by outside things in my living room than at the cinema. Someone walks in/out for a pee and you catch that in your peripheral vision in the cinema.
Now, if you could hire a "mini" cinema, so a cinema building instead of 10 500 seat screens had 500 10 seat screens...... and it wasn't insane to hire your own and you can have 15mins extra time and a remote control.... that would probably be great.
