3-5 people didn't like it and all of the sudden people are second guessing getting one. What about the 1,000+ people that own them and have been very satisfied? For the Q's price point and ability to be tailored for little additional cost, you will be very hard pressed to beat it. I have been beating on my 2 standard 12" Q's for over a year now and haven't had one person say anything negative after hearing it. They usually say, "I don't need anything that loud."
If you are an uber SQ guy, like some here are, than you may not like the Q. You will end up spending much more to get a better all around sub and I bet you will be sacrificing output when you do. It depends on what you are willing to spend in relation to the performance you get/desire.
I am not saying the Q is the end all be all of subs. Don't ever think that I would be ignorant enough to post that. I know I am very happy with mine and many others are as well. It seems the same few people that were not satisfied with theirs happen to post more than those that are happy.