No of course it's not the only way, but for ME, the drop down notifications and being able to quick Mark as Read or Delete was one of my favorite features of iOS8, so it was pretty important to be able to do that one handed, for ME...and maybe for the guy from that review.
Great. For YOU. That's not what the reviewer said. He didn't qualify it or explain it like you are trying to do now. He just said it couldn't be done. That you couldn't quickly glance at your device or email. Therefore, he LIED. He was inaccurate in his statement. He was unclear. He was lazy. Pick whatever adjective you want. What HE said in his review is simply not true.
I'm not going by what I think the guy in the review wanted to do. I'm going by what he actually said. Not sure why you are intent on arguing such a clear and blatant case of a POORLY WRITTEN review.