I finished season 3 of Atlantis in record time (though I skipped a couple of episodes including Sunday *sniff*), so here's the tally!!( Season 3 )
So, season 3 seems to be far more bloody and violent than season 2. Lots of damage inflicted by our team and the wider expedition, and McKay, Destroyer of Worlds makes his debut after a dress rehearsal in Trinity last season - Rodney firstly barely hesitates to wipe out the last of the former Wraith from Michael's hive, then is the person to execute Ellis nuke plan on the Asuran homeworld that destroyed their fleet, and likely took millions of Asurans with it (or course this is only a partial genocide - he'll commit genocide properly next year). Carson died this season (wails uncontrollably) but not before killing a Wraith (which seems extremely out of character even all these years later). Slacker of the year goes to Teyla who didn't seem to do much ass-kicking at all...I think pregnant Teyla next year kicks a lot more ass. And way to go Lorne - taking out a hive ship as his first kill of the series! And special mention to Elizabeth, who makes it through her run as a regular without killing anybody.
And that's why Weir is awesome!