Both ways seem equally common, dots or dashes.
I'm really not worried about it if the Info Lookup just gets the name for me, though.
Whats important is the Series/Season/Episode parsing, which seems pretty good, with some small minor problems.
There is only some minor cases where a file is called for example Castle.2009.S04E03.mkv, and it puts the series name as Castle 2009, and i have to move them to the plain "Castle" category every week, but i guess that might not be easy to be fixed.
I have a similar problem with sanctuary.us.s04e02.mkv, i really only want "Sanctuary", but it always makes it "Sanctuary Us".
Too bad it isn't smart enough that i could teach it some of the mistakes it commonly does (ie. Castle 2009 -> Castle, Sanctuary Us -> Sanctuary), without me manually changing it every time.