I can't get along with Reddit but I'm not sure why. How do you find things you want to talk about? Is there a one step page similar to MN active conversations? or do you have to actively think about something you're interested in and go and seek it out, rather than just coming across interesting conversations by chance.
I've had some very limited experience over there (through an invitation) and the up and down voting is weird and the organisation of the threads is hard to fathom, by which I mean the nesting thing and the order in which they appear.