I really like every season, really, and I don't feel like seasons seven and eight dropped the ball where continuity was concerned. Maybe in some other areas, sure, but those might just be my favorite years despite that. (Kind of a bold statement, I know.)
I caught up on SG-1 as it aired its first season on Sci-Fi here in the States, which means its sixth because it was on Fox syndication for its first five. Sci-Fi used to air four-hour blocks of Seasons 1-5 on Monday nights in an effort to get people caught-up and interested, and it worked on my grandmother and I!
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K | H | A | Q | Q | A | H | K
"we're about 50 years behind the rest of western society." -icon on B8