From the WW's complete food guide:
Cheesecake: any type/fast food 1 serving - 8 points
Cheesecake: frozen 1 serving 4 oz - 9 points
Cheesecake: w/ fruit topping 1/16 of 10" cake- 10 points
Cheesecake: w/o fruit topping 1/16 of 10" cake- 10 points
Look what Dotties site says about the Cheesecake Factory - YIKES - They are huge pieces though.
Cheesecake Factory
Main Menu Item (Per Slice)
Original Cheesecake (640 cal/45 g fat/54 g carb) 17
White Chocolate Raspberry Truffle (910 cal/61 g fat/81 g carb) 23.5
Vanilla Bean Cheesecake (870 cal/62 g fat/69 g carb) 23
Dulce de Leche Caramel Cheesecake (1010 cal/71 g fat/84 g carb) 26.5
Keylime Cheesecake (710 cal/49 g fat/64 g carb) 18.5
Brownie Sundae Cheesecake (960 cal/62 g fat/96 g carb) 24.5
Fresh Banana Cream Cheesecake (860 cal/61 g fat/70 g carb) 22.5
I think for normal cheesecake, if it wasn't super huge then 4 sounds about right. Remember that you are learning to keep your portions in control. It's just important that you get fairly close to your points. I always pick what I think sounds right and move on. You did great!
Melanie