I loved SG-1. To me it only gets better until the Ori, then it starts to waver and within a season or two is finally canceled. The first few seasons are a bit dry without a whole lot of character development, mainly focusing on exploration. This changes as time goes on starts to focus on the war with the Goa'uld and our own government's bickering. To me it's a classic series that is well worth watching. Plus I love Amanda Tapping. Never got into Atlantis, never cared for the cast and haven't bothered with SGU either.
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