I tend to agree, air rifle scopes are for air rifles and CF scopes are for centrefire rifles, I'm afraid to say you get what you pay for, so the big brands tend to win hands down for CF rifles.
Ive had alot of cheaper scopes and ended up selling them on at a big loss in order to buy a S&B, Nightforce, Ziess etc. The more you spend the better quality glass you get, which gives you the ability to see later into the evening, all scopes are good during the daylight hours, theres only a few that are good in twlight.
I once bought two top of the range Leupolds and went stalking Fallow in Berkshire, Its was nearly dark when I saw a good Fallow buck, I couldnt see it, so my friend shot it using his Ziess, you could say a lesson learnt for me.
If you are on a budget either save for a good brand, or try and find a good quality second hand one, you wont regret it!
Hope this helps.