I disagree. I'd even argue there really isn't a focus after all. It's a massive site with an even larger userbase.
For example, once you leave the top 10-20 subreddits, you encounter places like /r/askscience, /r/books, /r/hiphopheads, /r/dataisbeautiful etc.. All primarily discussion based subs with consistently in depth threads on esoteric topics, even by HN means.
That's not even mentioning the live updated threads on huge news stories, or all the sports subs with their game threads and on the second updates. It's a viable resource that's looked down upon because of the front page, and that blows.
I dont understand why you would try to generalise a site with 110 million users and billions of pageviews. It's a very narrow point of view to hold.
If you go through the top 125 subreddits [0], I think you would find that a small number of them can be categorised as you say - but the vast majority would all hold their own nuances and generalisations
[0] - http://redditlist.com/
In general blogs are abandonded after their first post.
In general does not really make sense on a place as big as reddit.