Just like everyone has said, Samsung actually does support their devices. There are alot of folks who would want you to believe other wise, but it's not true.
And like Vgameman2011 mentioned, I never had any problems with the Instinct, I had it for over a year, and I can clearly think of two large updates they did to that phone, which mean there may have been several small updates in between.
*going into personal opinion*
I have owned both HTC and Samsung (and motorola) and I prefer Samsung. Their devices feel solid and are well built, I have never felt that any of their devices were cheap. Never have they had quality control issues, unlike HTC, which can't seem to get that down. Not to say Samsung is the best ever, they have issues on some devices, (GPS on Moment) but they are far from a bad phone producer.
It is a mystery to me why the HTC fanboys like to come into the Samsung Android forums and bash Samsung, they do it here and they do it on the Moment forum (and likely on any other Samsung sub-forum). I don't see Samsung fans going into HTC forums bashing them on their crappy screens or terrible quality control. I like that I have never had dust under the screen of any of my Samsungs...