Convenient from the airport terminal. If you want to catch the fast train, check the schedules as they do not run to full speed all the time. Trip is fast. Not much scenery.
As others have reported, be careful of taxi scammers who will charge you up to 10x more than the actual trip cost. If the driver does not want to operate the meter or offers you a pre-paid fare, get out, he is trying to scam you.
We had the same experience and then just got on the Metro which was clean, fast and efficient
Would have been good if the Maglev arrived closer to city centre, but I suppose this would be impossible to engineer.
Did not visit the museum