My iPhone will pretty much run out of battery if I leave it at above 50% brightness for a day, so I bring it down when I'm indoors and raise it when I'm in sunlight. This was a lot easier when I had sbsettings in my notification centre.
I really, really don't understand the argument against options. The iBooks app has a toggle for adjusting brightness when presumably you're going to not be moving or suffering from changing light sources while reading, so I don't even understand what criterion Apple is sticking to when deciding people should need to access brightness controls. Same with my iPad. I need to adjust my iPad brightness a lot less than my iPhone, but bam, the iPad just puts that functionality in an easy to reach place and the iPhone doesn't.
I'm really pretty happy with iOS overall, I certainly don't require all the customisable stuff Android has, but the jailbreak community has established tweeks that have been offering superior interface choices for months and years. It makes SO much more sense to slide your finger up to bring up the multitask bar than it does to double tap home. It just feels like Apple are afraid to make any change unless they feel they absolutely have to (notification centre, for example)