Well, at least this episode didn't foreshadow the death of a major character...
Aside from that though, this wasn't a half bad episode. Certainly, as has been the case all season, the wedding-centric storyline was pretty lame. Tracey Ullman was fine as Robin's mother, but all the "I'm marrying a man just like my father" panic was not only cliche, but incredibly forced and not at all funny (one line aside). And, of course, the ending ominously sets up yet another ride on the Ted/Robin merry-go-round (this time begun by Robin), which we at least all knew was coming based on previous flashforwards.
But not only did the main plot of the episode circle back around to a plot point we'd all groused about previously (the abrupt way Lily conceded the argument to Marshall, and where she went in the middle of the night), but it also relied less on obvious callbacks to past gags on the show (Boats Boats Boats aside). Most importantly, it was funny. Granted, I'm a sucker for the Captain, even though he's always been more of a cartoon than an actual character, but I can't deny laughing at his forced attempts to work boats into everything. And Ted's Hercule Poirot-esque drawing room whodunit breakdown may just be the comedic highlight of Josh Radnor's season (though just like the Captain, I'm a complete sucker for any gags built around The Mosby Boys. Blame my love of The Three Investigators).
Then again, maybe for the first time ever this season, perhaps I'm just glad the Mother wasn't in this one. It's amazing what a difference ending on the reveal of Marshall and Lily's future daughter rather than a grim portent of death does for one's enjoyment of an episode.