I had the same thing - maple moon. Not sure whether it was that ale specifically or the flavour of maple, but it's a weird dirty sickly flavour. Maple leaves unfermentables, like malt, so it's a pretty good sugar additive in that sense - less thinning out, but mostly ferments out. There's absolutely no reason you can't use it, chuck it in at the end of the boil to sterilize it.
Give it a blast though, you won't be disappointed. Basically all sugar additions like this - molasses, honey, golden syrup - just add a quick aftertaste, but try it, it might become your "on tap" beer :)