A few people have mentioned this and I really felt the exact same way when I walked around - it felt like I was in a market in the third world. The ceiling and floors were broken and the ceiling was dripping into a bucket in one area right in the aisle. A lot of the vendor stores were messy and cluttered.
I like to be generous with 3 stars. This is the third flea market that I went to check out on my own and its the worst. But its one of the only Toronto flea markets (out of 3 I think) and I would really like them to improve. St. Lawrence Market may be the cleanest, classiest, and most well known in Toronto, but the Downsview Park Merchants Market is quite nice too in a traditional way. I recommend checking all of them out for yourself especialy Downsview.