The Razr, like all of Motorola's recent phones, is all show and no go. Opposed to their phones of years past which were no show and no go. To find a worse interface on a phone you'd have to start using phones from the likes of Samsung or perhaps LG. I'd be willing to bet most of the J-phones fall shy of Nokia and Sony Ericsson.
The Razr has been over-hyped for the past 1.5 years due solely to its thin profile and reasonably Star Trek looks. Even if you like flippers (I don't), you should stop to try not only its GUI, but also tactile feedback. I was very unimpressed with the feel of the phone in general, not to mention its shiny key pad. It's just the opposite of what I look for in a product in so many ways.
I'd really recommend you look into the newer Nokia and Sony Ericsson offerings to find something with better ergonomics and the best interfaces in the business.
Bruno