maybe they've got a poll ready to see if the silent majority also hates everything.  keep it short and simple, e.g.:

• do you like the new site appearance? (yes/no)
• do you like the old site better?(yes/no)
• would you like help in adjusting the site colour scheme to your personal pref? (yes/no)
• which one of these adjusted site colour schemes would you prefer? (give them about 10 screenshots)

then allow them to select the site theme/style they prefer and switch it to that in their browser.