Home usage/gaming usage, QD1 is typical and they are pretty much around the 30MB/s mark. Not surprising either, ultimately a single queue(or user) asking for data is requesting a 4kb read then getting it then requesting another one. So the latency is the biggest hold up in the chain. read-request-read-request. NVMe helps reduce each request which increases the number of read/requests.
With higher queue depth you have the latency of requests overlapping and get lots of reads going on. The higher the queue depth the more likely you can get constant reads happening.
It's a shame really, almost every review site has moved over to testing mainly server loads on any storage because it shows up performance differences. Almost no one does a benchmark of how fast a level of a current game loads, something they all used to do. Majority of say Anandtech or most reviews site viewers are home users. It's all how will this ssd effect your home usage, let us show you by informing you how much faster this ssd is over your current one in a server situation in which thousands of requests come in to load a 5MB webpage every few seconds. It's 30% faster.... thus your game will clearly also load 30% faster.
It's not surprising, if Anandtech showed Crysis 3 loading within 0.2 seconds on every SSD available in the past 3 years... they'd stop getting sent free stuff to test.
http://www.anandtech.com/show/8979/samsung-sm951-512-gb-review/7
look at the graph below the one you posted on that page. QD1 is improved on the 951... but not much, it's firmly below the 50MB/s and almost every drive ballpark the same.
