First off. Let's get somethings simple out of the way. This list is the ONLY WAY to obtain a 1,000 hours or 1,250 hour restricted ATP (depending on your degree and specialty) otherwise you'd need to military. If you went somewhere not on this list you need 1,500 hours.
https://www.faa.gov/pilots/training/atp/media/Institutional_Authority_List.pdf
The restricted ATP is worth a lot. That is why I personally am a supporter of aviation universities if you have the means to attend it. If you are eligible to get into an airline with 500 hours less thats roughly 6-8 months of flight instructing time. In those 6-8 months the way the regional airlines are hiring now (we'll say 40 a month average) that's a difference of 240-320 pilots ahead of you in seniority. Ask any active 121 pilot how important seniority is. That can be the difference between furlough or not, line holder or not (85 hours of credit on 13 days off with per diem is a lot more money earned than 75 hours on min guarantee with barely any per diem, and only 11 days off). Captain upgrade or not. And if your specific regional has a flow depending on the flow number that can be years difference. Now take an airline top scale. Let's say it effected your flow date by two years (at a minimum), thats roughly 400k lost (assuming you'd top out the scale at a major which is likely if you entered young and could give about 20 years at a major) (by the way that alone paid back your tuition) since it was 2 years less you spent at a major, all of a result of the 7 months difference in going to an airline since you weren't eligible for a 1,000 hour ATP. It would also effect quality of life which has a significant value on it as well. I have flown with many First officers both from and not from aviation universities, there are always bad ones and good ones from all backgrounds, i have noticed no more attitudes or whatever you will from ones with an aviation university background than not.
My point in all this is the math is there. It is not an intelligent thing to bash the aviation universities programs especially in this day and age when it is possible to get in to an airline with a significant reduction in hours which translates into many things. I think it is important to look at the path you plan on taking and lay out what is important to you. Definitely do not think it is the only way, but definitely don't overlook the aviation universities either.