Focusrite makes quality equipment, most particularly the mic preamps are very good for the money. They started out as a company with Rupert Neve designing their circuits for a console that cost a cool million dollars, branched out into high end discrete-transistor, transformer-based separates (the Red and ISA series), and then came out with the Platinum and Scarlett stuff that is IC based. In other words, their designs were top-down, not bottom-up like some companies.
Regardless of your price point, they do a nice job with their stuff.
Recording drums or a live band will be a problem with an interface that only has two inputs. If you want quality audio, your $600 price point is probably unrealistic. You'll probably have to go closer to $1000 to find an interface that will be able to record a drum kit, unless you're a "put one or two mics in front of the kit and record the kit separately" guys, OR you can submix the drums and/or other instruments through a small mixer, and record its outputs to stereo.
We live in a world of pretty amazing technology, but your budget isn't going to allow you to do what you say you want to do unless you already have the mixer.