Sounds like an uninformed reviewer! One thing you don't want is MJ Plants sitting around in wet soil. They need to be watered and then the soil needs to slowly dry out, which will happen in cloth pots. You do need something under them to catch the water.
This is what I use, something like this
I bought 4 or 5 of them at a job lot type store for a lot less than that too...
I imagine you could use any type of pan under them that works for you!
Some of the guys use a wet/dry vac to clean up after, but I just sop it up with paper towels or whatever