Personally, no, I really don't think they are. It's funny, because when I was starting out, I thought I would never pass consistently without having a laundry list of cosmetic procedures done, but as it turns out the bar for passing wasn't nearly as high as I thought it would be. I was just being too hard on myself early on, and I really shouldn't have been. It wasn't until I really started thinking of myself as female in my own mind, that I started to be able to see that things really weren't that bad. Even though I wasn't perfect, there was nothing about my appearance that would out me to someone who didn't know what to look for.
What I've come to understand, is that there are three kinds of passing. There is "passing", where you are probably being clocked most of the time, but people are respectful enough to gender you correctly, based on your presentation. Then there is just regular passing, where there are things about you that may stick out or seem out of place, but they aren't enough to cause most people to question your gender. Then there is stealth, where no one would ever know you were transgender unless you told them. Stealth is really hard, and it may be beyond a lot of us. Even regular passing requires some work, because you can be outed by things like your voice, even if you do everything else right. But if most people gender you correctly when you're wearing jeans and a t-shirt, it's pretty safe to say you have reached that level.