The MTCC gets a solid 3* in my book.
Over the years, I've had to spend many hours here as either an exhibitor or attendee. On the bright side, it has almost everything you would need to run a successful show. The halls are very spacious and there are many rooms that can be booked for seminars, product demos etc. The staff I have interacted with have mostly been very nice and professional.
There have been a few items that have really annoyed me over the years and it's frustrating that not much has improved. For one, there is terrible cell reception in the large exhibit halls. I've been through every provider since I first started coming to the MTCC and this has never changed! Finding a decent place to have lunch is also an issue. Your choices basically simmer down to Subways or walking to Union Station! Finally, the walk to Union is not all that short, but I don't suppose anything can be done about this.
Overall, you will end up here for something or another at some point if you live in this city and your experience will likely depend more on how the show is run than the building itself!