I hate it how unfriendly it is to make a quick summary of anything. If I want to see tournaments played last month, I can't just click to go previous months in the tour calendar but I have fill in parameters - which dates should be displayed. That is unnecessary, adds multiple clicks for no good reason and alienates users (me, at least). Similarly I can't just scan through a whole draw to get a bigger picture, I simply have to deal with tiny section of the bracket one by one.
The h2h and surface stats are nice extra bits, the new site might be an upgrade for following one player, but general overview of what is happening on the itf tour of your chocie is out of reach, you have to dig things from user unfrieldy format, as things have to be more colourful, not just plain text lists, and thus can't fit one page and you easily lose sight of who is in the same quarter of a draw by forced extensive scrolling.
I also hate on junior tournaments pages, if you want to check the girls side of the tournaments, you have to switch from the boys every fricking time you change a tab.