Stayed at Delta 2 Novembers ago, wasn't great. Front desk staff were somewhat clueless about late checkout (it was complicated. I was offered at check-in, declined, but later thought better to have it and asked for it, when I was told they would have to "check"). Lounge is simple affair with some hot food which wasn't bad.
Don't think service was great, given this is Canada (comparing to Vancouver) and people in general are friendlier than in the US.