Hey Sakthi,
Yes, I agree. I'm actually working on the testing for upgrading to vSphere 5 at the university I work for at the moment, and I've been somewhat underwhelmed with the web GUI. I find it rather slow and unwieldy at times. I may reboot my vSphere Client for Linux with compatibility for vSphere 5 (at the moment it's based on the API for vSphere 4.1), but I'd have to know if there's enough interest before I start the project again. That's a lot of coding! 
Any suggestions on how I can gauge interest? It seems like most people bit the bullet a few years ago when 4.1 was released and ran a Windows virtual machine so they'd be able to use the vSphere VI Client.
Fraser