I would really like to see this sort of thing worked on more.
1. This sort of theming botch ironed out - the Indicator Applet is inconsistently themed
2. For toolbars and widgets to fit properly, especially in Firefox and Open/Libre Office
Mint-X is otherwise great-looking. I've looked into fixing it myself but despite a slightly above novice grasp of gtk theming it's beyond me. To me it seems odd that Canonical or Novell haven't paid someone to solve this general issue by now. Whenever commercial organisations use Linux these things are ironed out so that things look professional, for example with Android tablets and the Linpus OS on the Acer Aspire One.