It doesn't matter how random you are if you just get grabbed. The truth is, the majority of players out there still have horrendous combo d.i. and really bad precision, control, and a consistent level of technicality @ high level play with their Fox. Oh, and they are really, really dumb.
Being random and trying to run and around and WD / look for openings has its 'fail' points. First of all, DD/space camping and refusing to approach will probably make the match turn into something like this (vs. a seasoned melee player)
:
you DD camp and WD randomly and decide to not approach
Your opponent gets smart and overshoots a grab/dash attack with Marth for example
your stock disappears.
The more random you try to be, the more REPETITIVE you actually end up becoming. There are only so many ways you can use your WD and empty SHFFLs to trick your opponent. Eventually, you will start developing some predictable patterns of movement that will work against you in the long run. (i.e.: You DD left/right/left then WD back and run backwards. Your opponent guesses that when he runs close you'll run away, dash attacks or grabs a little bit farther than usual and gets you.)
When it comes to being really good at this game, its all about finding the best and most rewarding styles of play - then emulating them.
Ken, P.C. Chris, KDJ, Isai (I'm intentionally not counting M2K because his ledge-camp/gimp Marth style is really stupid and repetitive - and can be half-avoided by camping back and not going to the ledge)
The common trend we see between all the top players is that they were ALL AGGRESSIVE. They never excessively DD/Laser/Ledge camped. Force your way into your opponents space by reading them and cornering them. Once you get a grab or move do as much damage as possible, and don't screw up. When you knock them off the stage, keep them off. Don't do this half *** **** where you DD around the edge and wait for them to come back on. USE YOUR HEAD AND FORCE THEM OFF.
I could go on and on with this. General idea is that random, campy, and technical are all overrated. Its about being 1. smart, 2. technically sound (not missing l cancels, edge-guards, 3. not being random and actually having a plan when it comes to things like countering camping/ledge-guarding/move selection while stringing together a combo.
This is kind of stuff you watch the pros do but need to learn yourself.