1) The design is nice, clean and simple, and I am a fan.
2) Working in tech, when you redesign things, there are always a lot of complaints. These complaints tend to fall into two camps - "I DO NOT LIKE THIS" which usually relates more to not liking change in general and those complaints often fade; and repeated comments on the same topic. THOSE are the ones that matter.
3) For me, I think there are three issues that seem small-ish but stand out:
a) The extra white space, as some have already noted, particularly around the message board, is distracting rather than simplifying. To me there is now a lack of information density on the league page and that is making it harder to navigate.
b) the single-line Trade Block update text is a struggle. Parker just updated his block and having to horizontal scroll to see what he said it not ideal.
c) the formatting is wonky on mobile. I'll have to send a screenshot later, but on the team page, stuff no longer fits horizontally and when I scroll right to see what falls off the screen, things are not aligned properly in their boxes.
None are huge changes, but they would be nice fixes. I'd also second some of the font comments. not sure if it is a darker text color, more use of formatting to separate stuff, or what, but I think it could be easier to read.