He's less lively in SG:A. But here's a funny tale.. I was watching SG:A for the first time and was keeping myself absolutely spoiler free. Didn't look at the Stargate forum here, didn't look anything up online to go with the episodes I watched (very difficult to keep from doing, LOL), and I would skim/skip any post anywhere that mentioned anything about any stargate at all. So I was in about season 3 of SG:A when I went to a convention and got to hear Robert Picardo speak.
Picardo: "Now when I took over command of Stargate Atlantis for season 5.."
I was spoiled by Picardo about Picardo!