Let's step out of D&D for a second : do people in Obsidian take pain to try most CRPGs out there or is everyone just following his gaming inclinations ? How well do they know foreign games (the first Gothics for example) and do they replay old ones ?
We know Sawyer's tastes quite well by now, but what of the others ?
Oh sure, I would say almost 99% of Obsidian are RPG fans first.
Some Obsidianites, like Jeff Husges are definitive experts on the Ultima Series. For example, there was a time when Josh was playing through Ultima 5 I think at work and he sort of outloud remarked that he couldn't remember how to play "Stones". Jeff happened to be walking by, popped into Josh's office and banged out Stones in one try without mistakes on the harpsichord in game which opened the secret door, then Jeff left the office. The whole time he never said anything... like a boss. Truly a Codexian feat.
Former Obsidianites, like Tony Evans, was an expert on Might and Magic, both the good and the bad.
Almost all of us played the Witcher 1 and 2.
The Gothics didn't come up too much in discussion.
I've played plenty of older games, like Tunnels and Trolls, or older SSI games like Rings of Zilfin and Demon's Winter. The Standing Stones is one of my favorite blobbers, probably because it was the first one I remember beating and it had great music.
Many Obsidianites are fans of, and have played the crap out of the Phantasie series.
Wizard's Crown and Eternal Dagger are talked about quite a bit.
Almost all the board games we played are European.
Those are the most ready examples that popped in my head, but I am sure there are more if I can get these old neurons firing.