As DemICE said everyone has different standards
SRing for a hidden ability is not worth it in my opinion as you can simply use an ability capsule
For IV's on the other hand, you can always breed for them later (gendered pokemon can generally give you better IV's after breeding simply because you have more variety of pokemon to breed with apart from Ditto)
If you, however, don't want to breed then you will have to SR quite a bit. For your question on offensive IV's, Pokemon generally tend to favor one offensive method over the other i.e attack and special attack. If that favored stat is single digit, you know it could be better and hence SRing would be advisable.
I don't know if this is just my luck or how the game was designed but my event pokemon towards the start of the game had pretty bad IV's. However towards the end of episode 16, most of my even pokemon have a high average of around 25 in each stat.