A late try from Robert Harley gave them a 29-26 bonus point win against the Cheetahs but skipper Ryan played down Glasgow's early-season form before looking ahead to next weekend's Champions Cup trip to Exeter.
Speaking in The Telegraph, Ryan said: "We could definitely play a lot better but it's the sign of a good team that we're grinding teams down, keeping them close and finding a way to win.
"We're certainly doing that at the moment but I think we have only clicked once, against Munster. This was not our best performance but coming over to South Africa and getting five points is a pretty good achievement and it's a good way to roll into Europe.
"We've only conceded eight tries in our six PRO14 matches, and our defence is certainly something that will win us games. We can certainly get better there but it's pretty good. The boss (head coach Dave Rennie) said he can't believe what perfectionists we are.
"We are getting five points against teams and we are disappointed. It's just the way the players in this group are - we want perfection. We got five points against the Cheetahs and we are still thinking 'what could we have done better?' I don't think many teams look at it that way so it's a good way to be."
Glasgow's focus now turns to European games against Exeter, Leinster and Montpellier, with Saturday's trip to Sandy Park followed by a home game against Leinster and then a double-header against Vern Cotter's Montpellier in December.
"Winning at Exeter is a heck of an ask but with the group we've got I definitely believe we can go down there and win," added Ryan. "It will be interesting to see how we go against Exeter as they look to play a lot of rugby like us and are playing well at the moment. But we believe we can go down there and win and we won't be thinking of anything else."