I disagree strongly with LightPheonix.
It's a good thing I'm the "oe" version then.

As a random aside, I fully expected you to be the one to disagree with me. I don't mean anything negative by it, but I've noticed that we have very dissimilar tastes, to the point where you're one of the people whose opinions I'll look for to gauge what my reaction might be.
Atlantis was at time an interesting show, sadly however it degenerated too often (esp s4-5) into the 'Rodney McKay show when you were lucky to find McKay not being in the A Story or B Story. His character I didnt like to begin with which may have colored my views on those 2 seasons.
This pretty much sums up my problems with the characters.
The rest of the characters felt like flat copies of the SG1 characters (roughly) and never really grew out of that. Sheppard was O'Neill, Ronon was pretty much Teal'c, and Teyla was Carter's military plus Daniel's diplomat mashed together. Even McKay was Carter's science plus Daniel's quirkiness. Specifically, I couldn't stand McKay, especially once they started putting the entire show on his character, to the detriment of the others. He completely overacted every scene he was in, even in SG1. That said, he
was a main character, so I would expect him to be in every story. The only one I really liked was Weir, who was different enough from Hammond to be interesting, while fulfilling the same role.
However, my biggest issue was with the writing, which I found very sub-par compared to SG1. This is especially true later on in the series, especially seasons 4-5. The same seasons in SG1 were pretty much the hallmarks of the series. SGA didn't hold up as well as SG1 either, IMO. There was a lot of promise there, a lot of potential, and a lot of neat ideas, but I think it ended up squandered because of the writing.