I think the entire view of whether it is more fun to discuss basketball, specifically in this instance Celtics basketball, when the team isn't as good and is rebuilding vs whether that team is great centers around what one finds enjoyable.
For instance, if discussing trades, draft choices, free agents and basically playing Danny Ainge on a message board is something that you get into, of course if the team is bad it will be more fun because there is more work to do and more uncertainty in what you have. On the other hand, if discussing the subtleties of the game, specifically coaching strategies, rotations, matchups, and the basic chess match that quality play and playoff basketball produce, one will enjoy it better on a message board if the team is good to great.
I think ultimately the unknown will always generate more topic discussion and draw more people and opinions on any subject you want to discuss. How to build a team from bad to good deals with a tremendous amount of the unknown and I think is much more appealing to the average fan and easier for the average fan to talk about. But when dealing with a tremendous amount of known factors that are exceptional, you are now dealing with an entity that requires a more keen knowledge of the subject and hence is less appealing and harder to discuss for the average fan. Hence less talk and less ideas and less people talking.
I myself, and I probably can vouch for many of the "regulars" to this site, enjoy both. Does that make me a bigger or more knowledgable fan than others, hell no! It just means that I think I can speak in both types of discussions and have fun doing so in both.
I really believe that some of the less fun stuff happening this off season is, as Steve and Roy discussed early, simply because it is the off season and the team is built and we know what we have.
I don't believe that Celticsblog has become any less fun or less appealing. I find Celticsblog to be more of a community meeting place to discuss all sorts of topics that just so happens to have the least common denominator that each of it's members are Celtics fans. There are so many topics to discuss from baseball to football to daily news events(some anyway) to movies to bar etiquette to dating advice to just about anything you want.
I, like many members, find myself in front of a computer much of the day trying to make a living. I have a small business so there's very little office interaction with other people, working mostly out of my home in my office. Celticsblog allows me a fun way of interacting with others that I would get if I worked for a larger company and worked in an atmosphere where there were many people. For me, in many ways, it keeps me a bit more sane than I would otherwise be without contact from people.
Anyway, I think there has been a time when just about everyone has thought exactly the thought that the OP brought up. It does seem at times during this offseason that it has dragged and has been less exciting and the topics about the Celtics have been redundant and boring. But I think that is simply the impatience we all have awaiting yet another season of dazzling basketball excitement.
We're all just a bunch of Celtic junkies with the dts waiting for our next fix. Maybe that's why it seems the way it does.