I have a smooth collie and he LOVES people. He is trained to ignore them when he's working, but when he's off-duty his favorite hobby is schmoozing people. The day I met him he had his face in my face the entire drive from the airport to the breeder, flirting away. He's never met anyone he doesn't like.
He can be a watch dog, too, and when he barks he can sound intimidating (but my boxer usually provides the intimidating factor). He is very alert to what's going on outside, but not so much that he barks at everything. A few nights ago some creature was in the back yard and Logan was NOT okay with it - he was upstairs with me in my room, and he roared at the window when he heard whatever it was.
Logan is an extremely confident, outgoing dog, but a lot of that has to do with how he was bred and raised. I got him at a year old, and his breeder did a FANTASTIC job raising him. Nothing phases him, and he passed his ATTS temperament test with scored mostly mid-range, which is for the most part minimal reactions to anything.
I flew halfway across the country to get Logan. The collies around here (central US) seem to be very poorly bred for the most part. I was dogsitting a bunch of collies last summer and they all had some sort of fear/anxiety/shyness issue. There are some great collies around here, you just have to look a little harder - and keep in mind that the smoothies tend to have a different personality than the roughs, just by a bit. There was one collie I dogsat a few years ago, a rough, and she was an absolute doll, but had a lot of health problems. Things to look out for are seizures (very common in collies), eye problems (specifically CEA and related issues), skin problems/allergies, digestive issues, and joint problems as they get older (though that's less common in collies than it is in many other breeds). Logan has very, very mild CEA, and it doesn't affect him at all. The only thing noticeably different is that he has red eyeshine instead of blue or green. Many, many collies have CEA but it's not always a problem and often causes no issues at all.