I think there is a HUGE difference between "family" and "group" tents and though they need to be similar sizes, I think the considerations are rather profound.
I'm guessing most people here are not going to take their small children out on mid-winter trips. Just a guess, but I suspect the floorless tents with minimal ventilation are pretty much out for that group. I'd also guess that anything too fragile is probably a poor idea as well.
In most cases, traveling with kids is also going to mean less mileage, which means that heavier weights are not as big a deal. I could carry 30-40lbs if I need to for a trip with young kids, especially knowing that it's highly unlikely that I'm going to travel more than 4-5 miles a day. I'm not saying that's the BEST idea, but I'm saying it's realistic for a lot of families.
The cheapest tent on this list that is viable for a 3-season family tent is the TarpTent Hogback, at $375. And being a smaller manufacturer, there aren't going to be any discounts on it; the price is great for what it is.
However, in the interest of making this more family friendly, it would be great to see some more budget friendly options listed for comparison... An ALPS Mountaineering Lynx 4 is ~7.5#, 64-sq-ft, fully double wall with vestibules, and can be found readily for ~$150 (or less). The similar Edge 4 is $105 at REI Outlet right now...
Ozark Trail and Wenzel make some family tents in the $50 range that are roughly the same size, though without the full-fly, so no-vestibules; possibly a slight weight penalty, but as someone pointed out above, the freedom from worry when letting small kids attack a $50 tent is a lot different than having those same kids throw themselves against the walls of your $400 tent because they like how it feels to bounce off them (I've had this happen camping with friends).
Other options -- I saw the Big Agnes Copper Spur 4 and Fly Creek 4 have already been mentioned, but for reference, the CS4 is 57-sq-ft+vestibules, fully double wall, two doors, etc... and clocks in at 6#; the FC4 is a little smaller at ~50sq-ft and has only one door, but shaves it down to ~4.5#, and you can trim it almost to 4#-even if you use titanium hook stakes and leave the stuff sacks at home.
Admittedly, the Big Agnes tents don't save any money, with list prices at $600 and $500, respectively, but folks here have been able to get the CS4 for as little as half price lately on SAC.
I appreciate the work you did in putting this article together -- I think it has value, particularly for "group backpacking," especially for people looking for alternative shelter options, but for the family side of things, I think a broader article that showed some budget-friendly options would have been appreciated.
It would have had value, too, to show what you're really getting when you spend 5-10X as much money. Sure, $50-$100 tents aren't what most people here are going to carry up a mountain, but on a short hike, I'll gladly take the extra couple of pounds to keep the extra $300-$600 in my wallet, and also have the piece of mind that I don't have to worry about my gear if it gets damaged by children. When you'll be carrying gear for 4-5 people, there are plenty of other places to save back that same weight.