I disagree, Hubski's interface is hardly anything way out of the ordinary for it's kind of site; you have voting where the community decides what gets the most attention, your information and other tools are at the top, and you can follow users as well as tags; these are all things that people know from reddit or twitter, although it does take a day or two to learn the ropes of Hubski, I feel as though the sober aestethic (No image previews, very little bright colors) and the small, polite community (Which can be intimidating.) do more to make the site what it is. Lastly, you can't really blame a particular age group for reddit's current state, the one common denominator of the bad parts of reddit is a large reader base, /r/teenagers was a pretty polite place last I checked.
That's harder to say when you experience first hand. Hearing the freshmen in my school talk only about Reddit's "/r/funny" and "/r/adviceanimals" and how they should "lol submit this video of this guy grabbing his balls to /r/videos. You'd get so many upvotes man" really emphasize to me, in my opinion, how it's no longer as discussion friendly as it was.
No no no, It's not bad. That's why I don't like using the word, but it's really the most accurate one. I'll us an example. Recently, I saw one of my classmates using an off-brand Reddit iPhone app, so I said "Why don't you get Alien Blue? It's features are great, and it's even great without getting the paid version." too which he responded, "Yeah, it's pretty nice but it doesn't let me do this." So he's on r/funny, and this app lets him open a photo, go to the next photo with a tap, then the next with a tap, etc. So then I go "but.. but.. the best part of Reddit is the community! You can't even see the title, let alone the comments!" and he goes "Oh no, no I just think a lot of these photos are funny." Hubski doesn't let you quick scroll photos, even if this was a photo oriented website (thank God it's not). The discussion and the community, and in a way the interface require commitment. It's perfect.