I couldn't agree more. And if somebody posts a review of a 50+ piece collection within a day, it is just impossible to believe that this person tested the products in any depth. Yes, I understand that there is a pressure as popular blogs live on their fast and constantly renewed blog posts, but the quality of reviews will consequently suffer. I appreciate all the time-consuming work blogger offer, but I take it with a grain of salt.
What I have a hard time with is the fact that make up gets grades, especially when it is solely based on personal preference. Personally, I don't care much for purple l/s (for myself, anyway), but does that mean that every purple l/s should get an F because I can't wear it? C'mon, some of these grade systems remind me of highschool and all the drama associated with it.
If you don't like a certain type of product, don't review it if you can't stay somehow objective or try at least a bit harder to embrace new application technique or get some help from other MUA to understand the product. There are certainly products that are less pigmented, but there is probably a huge market for these type of products as not everyone feels comfortable to wear a dark purple or black e/s.
Please note that this post is not intended to criticize any particular blog and/or judge any individual, but it serves as a reminder for the online community to search thoroughly through various blogs, reviews, websites in order to build an informed opinion based on your make up habits, tastes, and skills before putting all eggs in on basket blog.