An interesting lesson in spin here. Looking around the web, it's hard to find this story without a negative spin attached to it. Every place I looked said "72,000 is terrible, hardcore games don't work on Wii". I found that to be very interesting. For example, Edge chose to phrase The Conduit's sales as being "under 72,000", which I thought was a curious choice of words since 72,000 is a completely arbitrary number. 72,000 can be considered a success or a failure depending on what you choose to hold it up against.
When placed against HOTD:O and MW, the other two Sega yardsticks (real yardsticks, not "Here's how we wish hardcore games would sell on the Wii" yardsticks), The Conduit has actually done quite well. Its first-month sales are 60% more than HOTD and 10% more than MadWorld in roughly half the time on store shelves.
Is the glass half-full, or half-empty? It's all in how you choose to spin numbers.