I think the SGA team dynamic is somewhat different from SG-1's (from what I've seen of SG-1, anyway), but there is definitely some awesome teamness to be had. I don't want to spoil you, so I'll just say that the teamness really shows up later in Season 2. For now, just enjoy the pretty that is John Sheppard. ;D

Why did Jack and Daniel get replaced by Vala and Cameron Mitchell, anyway? Jack got promoted to General, right? And Daniel? You'll get to see Jack again in Season 3 of SGA and Daniel in Season 5 -- and those were some pretty awesome episodes, imo.