If there are no collar ties, is that considered a defect, and should we as inspectors recomend they be installed?
The 2015 International Residential Code does not require collar ties (or collar beams). However, in those situations when they are specified, collar ties or ridge straps are usually installed in the upper third of the roof between opposing rafters.
It depends on whether you noted any signs of structural distress.
How technical do you want to be?
If it looks funny to you say something.
Well maybe now you can figure out why your pitch should be listed as roof slope.