It’s my opinion and choice of venue, for which you certainly disagree. I think it’s fair to say the one-star rating will be recognized for what it is. As I’ve learned, lower ratings are merely an indication of not hitting the target audience.
WordPress has abstracted its database layer enough that I’m able to host using PostgreSQL on Heroku. One would think a plugin asking for as much as this is per site license would have thought to abstract its data layer.
If you think of stars as recommendations, I would definitely not recommend this plugin due to lack of flexibility and cost. Yes, this is the free version, but I’m only in the evaluation phase right now.