Tracker-style has it's definitive advantages, but also disadvantages in my point of view... like Tonka said, it's a lot easier to do quick complicated melody lines, inkluding drums, but lengths are a pain in the ass!...
Another aspect of the tracker that does not apeal to me is, that it's meant for programing, and not performing... If you know how to play a keyboard live, and want that "live feel", be it note lengths, timing or velocity, then trackers are no good really...
One thing I'd like to see implemented in synths (both hard and soft) is a tracker like interface for making arpeggiator and sequencer patterns... most such interfaces today will only let you compose the rhythm/melody if you program one note at a time setting all values by hand... would be nice to be able to do it tracker style, using MIDI noteons for editing, and choosing one key for "spacebar" doing the pauses.... just like when doing AMIGA stuff back then... ahh, those AMIGA days!
I personally like my synth music brutally sequenced and in perfect time. This (to me) is how synth music is supposed to sound.
or any other sequencer for that matter. I've grown too old for changes now 
