Arrrgh, there are a lot of interesting and good points in the article but for the most part they miss the wood for the trees. The actual answer is that care isn't being taken to develop a style that looks good and meets his constraints. Jeff needs a good art director. The Ultima V and Baba is You examples are excellent counter-points because they show how great games with simple styles can look.
And at least choose a decent font (looking at the first screenshot on the blog post)