Excel "Comment" Bubbles Need to be Improved

It's about time that Microsoft improve the "Comments" functionality in Excel:

Wow. Just plain ugly. Shooting from the hip:

• That shadow technique (angled lines) is a bit...dated.
• Square corners? Rounded would be much better, especially given the grid-like nature of Excel.  Rounded corners would create a nice contrast to the rest of the display.
• 8 ways to tug / pull / stretch?  Totally unnecessary.  Why should this be resizable to begin with?
• Default size: about four rows of text high.  Doesn't automatically resize.