Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
I wish this grill was a better product, because it certainly is a great way to cook fish, etc., but the surface is impossible to clean completely.  Also, it warped, and on our Kitchenaid glass-top stove it no longer lies flat.  This product is really not up to the Calphalon standard.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: D: negative