Not for the 2,000,000+ people who don't have ready access to the REM. For me, driving to the REM, lugging bags onto the REM. Plus the 41 minute transit time. And to my knowledge there is no long term parking at the REM.

YHU will save me 30 minutes driving in optimal conditions, but likely an hour each way + a more efficient airport experience + probably much cheaper and easier parking.

I'd pay more for a ticket to avoid YUL if flying domestically.