Is there any replay value in the Curse of Naxxramas solo adventure?

If you have the "Win 7 games in any mode" quest, Solo Adventure matches count, which includes Naxxramas.

So if you're just looking for a quick way to win against a known deck, bumrushing Maexxna with a charge deck is gonna be an easy way to get your 7 wins.

Beyond that, there is no reason to replay the wing.

Currently, no. Once you earn all of the rewards for the quarter, there is no point in going back and replaying them.

I would assume that at some point in the future, people will do races to see who can go through Naxxramas the fastest or something along those lines.

You can always try to challenge yourself with building different kinds of decks that will beat the bosses in heroic mode (or normal mode).

To start with, one deck of each class. If you manage that, you can try imposing other limitations on yourself (only rush, only control, etc.). That way you can make many different interesting challenges. Your imagination is the limit.

How about replaying it for fun? That is why we play games in the first place.

'Replay value' can mean worth generated or entertainment gained. Single player games such as roguelikes have lots of replay value without giving any permanent advantage to the player.

Challenges:

• Use only basic cards. Or only basic+common. Etc. (credit:Sisk)
• Use your default deck.
• Use random pick deck. (probably not for hard level)
• Complete with every class.
• Complete with only one deck. (choose deck and class at the start)

If you played Naxxramas just for the cards of course it will have no replay value.