I've played all the Spiderweb games this year, with the exception of the Exiles, which won't run on my computer. I started with Avadon, then A4-5-6, then A1-2-3. Then Nethergate Resurrection and Geneforge 1-5. Now I've replayed Avadon and am working through the Avernums again.
The first Spiderweb game I ever played was Avernum 2, when it was still new. The only one I don't own is Blades of Avernum, but I did play the demo.
I have to say, these games are fun!