Nimoy was too brief to mention really, but it was my third time meeting him and when wrapping it all together he's a pretty sound chap so I still had respect for him.
Otherwise we were only there for Avery Brooks (as with him and the upcoming Scott Bakula I'll complete my Star Trek captains) and Marc McClure (as I grew up on the Reeve Superman films). Both of them were thoroughly nice guys.
In fact, of all the Trek captains Brooks was by far the most pleasant and spared the time to have a proper conversation with me (about his time in the White House no less). He also dragged my rather shy (and non-Trekkie) fiance forward to involve her in the chat. Although I managed a conversation with Patrick Stewart on my third meeting with him I bungled it a bit by pretending to know more about the playwright Henrik Ibsen than I actually knew!! Mulgrew was a bit stuck up, but I got to chat to her husband who was just about to run for the governership at the time. Shatner was much like Nimoy this time around, very quick and rushed. So a big thumbs up for Avery!
Marc McClure was also very nice. There was a rather strange and very quiet asian chap in front of us when we arrived, and I think McClure had gotten a bit bored of him (I mean this guy literally took 15 minutes to choose a photo) so he started talking to the misses and I pretty much straight away. I got to talk to him about filming Superman 4 in MK of all places and that I had heard the Chris Reeve didn't enjoy it - learning that through an old client of mine who was friends with Gae Exton. Very enjoyable and a nice chap.
The missus and I also had a bit of a giggle about Philip Glenister. Neither of us watch Life on Mars or Ashes to Ashes so for us he's not a big deal....more so as well because he lives just around the corner from us and I walk past him on the street every week!