Cannot read the new fonts!

Cannot read the new fonts!

The fonts in the new style are not readable. The T miss the horizontal line as well other letters like e and H.
Please see this screenshot at http://prntscr.com/8vitpk I did not arrow all the letters. Can change the font?
The older version is much more readable.
By the way, why fix something that is not broken? I am wondering it often as many internet corporation does it.
Hope can fix the font, not the font I use to compose the email, the font of the new version interface.
Thank you