Umm... why would you possibly buy a sourcebook for a game system that you "loathe?" That strikes me as bizarre in the extreme.
How would I
know that I don't like 4e if I weren't familiar with it? Duh!
In all seriousness, I don't really "hate" it, exactly. But it does seem like you have to be either a "hater" or a fanboy, since so many people don't seem comfortable to admit any middleground.
I was nonplussed by the first few WOTC releases. (Lets blame it on a bad upbringing, poor genetics, limited intelligence, boorish taste and questionable grooming habits and leave it at that, shall we?

) After my initial disappointment, I *don't* in all honesty have much real ongoing interest in
4e.
4e is mostly an annoyance to me, since it sometimes intrudes on my lamentable fixation on it's outmoded, out-of-date, passé, antiquated, archaic, and obsolete forerunners. It's terribly perverse, I admit.
But regardless, I admit to a morbid curiousity about what a talented author and game designer would do with it.
I was actually pretty amazed by how much I liked the
Advanced Player's Guide, to tell you the truth. It's just that good. It won't get me to switch editions... I'm afraid my pathological aversion is almost certainly chronic... But it is a book that even I can read and reread with some enjoyment, and maybe even mine for ideas that I could apply to those more limited and plainly wrongminded systems and editions that I can better understand and appreciate with what limited intellect I seem to possess.
It's a good book.