I'd say that due to the number of HiFonics products produced and sold, yes, it does increase the possibility for error and a product being defective. I dont think that makes them a bad choice for your installation. From the stories I have heard about the HiFonics amps, most of the people that had problems were due to the fact that the Brutus series are slightly overrated, which might lead to people pushing them harder than necessary/what the amp is capable of (we are talking less than 100 watts here - which I dont think is a serious crime considering the other classic over-raters)
Additionally, you have to realize what the market for these amps is comprised of. People, with a limited knowledge of car audio, asking "what amp is good?", buying it sound unheard, and then proceeding to install it themselves with that same limited knowledge.
Obviously you are going to end up with a few burned up amps. Usually the people buying the more high end stuff have some knowledge, or had a decent shop that knows what they are doing install it for them, therefore, less cases of installation error, and less blown/"faulty" amps.
Not trying to make an example of the OP here, just bringing up a point.