I'd give Harry Putter and the Chamber of Cheesecakes 2.5 stars if possible. I enjoyed most of the book. There are both hilariously funny sections and abysmally stupid parts.
Although this was probably meant to be a spoof of the Harry Potter books in general, it isn't a great one. That's partly because the author tried to do too much in one short volume, and partly because it was not well-edited and organized. Bits and pieces from several Harry Potter books were thrown in here and there to fill out the story and its characters, but the final result left some inconsistencies and occasional unfinished trains of thought or action.
I thought the book was titled and mostly written to spoof "Harry Potter and the Chamber of Secrets." That's only the vague framework of the story, however, as the time setting was just before and during the (offically) Sixth year at the school. Often the author goes off on tangents to fill in information from the past, usually in Harry's daydreams. The result was a rather disjointed story, but still fun with some bright spots of humor.
The funny parts include name alterations, odd and unexpectedly silly incantations, and what I'd call "opposite-talk" character and plot changes. Some of the funny parts had me laughing aloud. Others were just tolerable.
If you're a serious Harry Potter fan but wary of plot and character changes, either read with a grain of salt or don't read it. If you love Harry Potter books, enjoy fun silliness, and don't mind stupid jokes, you're likely to enjoy the book, or at least most of it.
Oh, one more thing---my Kindle e-book version had errors in the text. Occasionally some pieces of sentence were scrambled from one paragraph to another. Maybe it's just the change from the printed version to the electronic version that caused this?