Before, sometimes a site would appear to have many similar results close together in the SERPs, resulting in a tree shaped result for that website. Now Google is showing them all as separate results all together. What do you think of this change? Does it improve the experience or not? Personally I think it's a bit unfair, because as someone looks down the SERPs, there could be instances where they see 3/4 consecutive results from the same website, meaning 3/4 irrelevant results in a row. The tree display made sure that if the results from that website were irrelevant, then you'd skim over the tree
It do not happen always, When Google calculate that the user typing some very specific word related a website then it show maximum result from that website... It is also good in some way.
Do you mean that additional pages were indented and are no longer? I have not seen this. Can you provide an example search? Indented pages are not pages that G has rated irrelevent. G would not intentionally display irrelevent results. Indents mean that they are additional pages from the same site.
Indented pages are no longer. Check out this search: http://www.google.co.ke/search?aq=f&sourceid=chrome&ie=UTF-8&q=chiwawa+renegade+lyrics