The books I've read (and how many times I've read them, if it's more than once.)

Best:

• Arabella (3)
• The Grand Sophy (3)
• Devil's Cub (2)

Very, very good:

• Black Sheep (4)
• Cotillion
• Lady of Quality (2)
• Frederica (2)
• Faro's Daughter (2)
• Venetia
• The Convenient Marriage
• Sylvester (3)
• The Unknown Ajax
• The Nonesuch (2)

Very good:

• Masqueraders
• Sprig Muslin
• These Old Shades
• Friday's Child
• April Lady
• The Reluctant Widow
• The Quiet Gentleman

Good:

• Bath Tangle
• Regency Buck
• The Corinthian
• Charity Girl
• The Talisman Ring

Mostly not good (but of course with flashes of Heyer brilliance):

• Cousin Kate

Gave up on:

• The Foundling