I'm sorry to hear your experience. The last thing we want is for you to have a bad experience, especially in front of a customer.
As John mentioned, we target tablets with our mobile sign in and mobile-optimized screens, rather than the regular sign in. In the sign in page, look for the Mobile link at the bottom (or short cut is www.miurl.cc/m). Also, on the next publish in a few weeks, you'll have the Intuit Account and Google Apps sign in links available too on the mobile page - the easier to sign in, the better.
Currently there is an Estimate screen available out of the box for you to do mobile quotes on - and mobile screens can be customized in a similar way to regular screens (but there are a few constraints, like not being able to show a screen in a popup).
While you can do the essentials on the mobile version (create an estimate, add line items, email it, etc.)...... the mobile version of Method is constrained. We know this. We already have a project underway to really expand the flexibility of the user interface and user experience of the mobile version - and eventually take advantage of some of the mobile's native hardware. I don't have a timeline for this, but when we are ready we'll be looking for early adopters and feedback.