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I don't mind open ended series so long as the author knows the overall end point so whole books don't feel like "filler." I also don't mind if a series starts as a trilogy and keeps going so long as the author does take the plot in a different direction and doesn't undo whatever closure was achieved with the original trilogy.
Or, as with the already mentioned In Death series, each book works as a stand-alone. The trick with this type of series is that the characters need to grow and change. I will lose interest if the main characters don't evolve as a series continues.
As a side note, the In Death series was originally set to only be a trilogy.
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