I was in the arena-I believe it was called the Baltimore Civic Center at that time-in 1989 or 1990. It wasn't anything special, but it was functional for sure.
When hockey took off in Cincinnati in the early 90s with the original version of the Cincinnati Cyclones, the Cincinnati Gardens wasn't anything to write home about. No air conditioning, inadequate bathrooms and concession stands and messy parking when the crowds were big-but the place was packed almost all of the time.
I'm sure there's more to it than the arena. If U2 or the Rolling Stones (or any of the other absurd geriatric rock bands) would announce dates at the Baltimore Arena, it would sell out in no time flat. There are very few arenas which will stop people from attending a desired product. I think it's an easy and probably inaccurate excuse for the reason why hockey has failed in Baltimore.