The first season was the best

She is kind of a Ted McGinley, but it's not her fault for the final outcome of the shows she's on, since it all falls down to the producers and writers at the end of the day:

Dark Skies: I don't think Dark Skies really Jumped the Shark as such, also Jeri was an excellent cast addition and many Dark Skies fans looked upon her performance with fondness.

She only turned up in the last half dozen episodes, Dark Skies's ratings were pretty untenable by then and it was going to get cancelled anyway by the time Jeri showed up. I thought she did very well, even though the series was drawing to a close too soon.

I honestly don't think she ruined Dark Skies, because it remained a very entertaining sci-fi series and the threat of instant cancellation hung above it since it's first episode.

And Jeri Ryan was not casted in because of her looks; there was some behind the scenes talk that Megan Ward and Eric Close had "artistic differences" and producers wanted to cast another leading lady.

Voyager: Voyager had the full seven season run, and then was succeded by Enterprise, Seven of Nine was a good replacement to Kes and by most accounts Jeri Ryan's addition to that show was widely considered a success.

Voyager never really "Jumped the Shark", since I never found the later seasons of that show any worse or less inconsistant than the earlier seasons. And it was never cancelled.

Boston Public: I heard many people who felt Jeri Ryan and Michael Rapaport were both decent additions to Boston Public, but they felt Boston Public itself was a crappy show to begin with.

I thought the cast was very solid and competent, but the show itself was not that great due to the banal writing that was only fit enough to entertain canines. I thought Season One and Four of Boston Public were slightly good, while Season Two and Three were utter sh-t.

And Boston Public did "Jump the Shark" but it did it with alarming frequency. You could say Boston Public "Jumped the Shark" when Jeri and Mike signed up, but then again you could say Boston Public "Jumped the Shark" when Harry Senate fired a gun in class, Milton Buttle got fired and Lauren Davis got stalked.

Then there was the incident with Meridith Peters cutting off her hand, then all the teachers began singing. Boston Public jumped over the fin yet again when David E. Kelly left in Season Three, Danny Hanson talks about being mollested by a priest, Sh-tney Houston pays a visit and Harry Senate leaves.

Then Boston Public does another round of shark jumping when the geniuses at Fox decided to shift it to Fridays, students start raping each other or get electrocuted then pretend they are Jesus and they bring in a bitchy Hispanic teacher.

Boston Public was never a great show to begin with and it makes me upset that great actors such as Chi McBride, Anthoney Heald, Jeri Ryan and Nicky Katt would waste their talents on such a terrible series.

And I've heard the opinions of many TV critics and people who felt that Jeri Ryan did an excellent job on that series, despite the series being in serious decline. And Nicky Katt was thinking of opting out of the series from a very early stage, which would partially explain why David E. Kelly made the cast changes that he did.

And Married with Children lasted for six seasons after Ted McGineley's casting you dummy.