I typically buy one or two adventures when a system first comes out to get a feel for the system and gain a better understanding of it's strength's and weaknesses. Unfortunately some publishers don't release solid adventures at time of release and this can make getting a handle on the system difficult and far less interesting. It definitely reduces my interest in further products in a system.
WOTC take note: Keep on the Shadowfell (which was what was available at 4e release) was awful.
WOTC take note: Keep on the Shadowfell (which was what was available at 4e release) was awful.