I would only be ok with that 1 1/2 hour (!!) delay if it was due to some unforeseen circumstances that made it impossible to avoid, and I would expect/hope for an apology or some explanation. If only when you arrived for the 3:30 wedding, someone had taken the time to have a left a note with the bartender, or a good friend to be there and explain/apologize on behalf of the bride and groom - anything! I once went to a wedding that accidentally put the wrong address down for the venue. They pretty much got a hold of each and every invited guest before the big day - but just to be sure, they also posted a note at the wrong address (a different section of the park in a pavilion) the mix up and where to go from there.
I also avoid driving at night if at all possible, and it is understandable that you needed to leave. I hate having to be overbooked and not being able to just go with the flow - in a couple of months I have two weddings to go to on the same day. I don't know what time either will be, so if something like an hour and a half late start were to happen - I might be in the same boat as you.