W Juliet doesn't really stick out to me in the gender bender series. The art is so-so, the reason for the cross-dressing is rather shallow (I personally found it a bit clichéd and unbelievable), and I thought that the romantic aspects of Ito and Makoto's relationship to be a bit hurried. Also, the length of the series is a bit much as any realism the series might have had is lost through ridiculous events. Even with these issues, however, it still comes across as a cute and amusing series. (It has watered-down versions of Ranma 1/2 chapters, if a perspective is needed. While this is amusing to some, it all depends on whether or not the series is supposed to be serious or if it's just a humour thing.)
The final verdict? If you're not new to the gender bender scene (like me), then this will probably be nothing special. I still recommend a perusal of the first few manga, though, since you still might enjoy it. On the other hand, if you're new to the gender bender genre, this is a great series to start with.
(In all honesty, I found Tenshi Ja Nai! to be a more fleshed out version of W Juliet. While it's not completely similar, the characters seem to be given deeper reasons for acting the ways they do, and the romantic plotline is gradually introduced. In short, if you like(d) W Juliet, you will most likely like Tenshi Ja Nai! as well.)