Super can be a dangerous waste of time when your young. Im the same age as you sanj, I enjoy looking at my super balance crawl higher and higher but I wouldnt lock away anything more than 9% in it because politicians cant keep their hands off the scheme, they have already moved the cashout age to 65, i bet by the time we reach that age they will move it higher again or make it so you can only derive an income stream from it no more lump sums.
By saying you think investing in super is a good idea your basically trusting your money with a politician...
While I completely agree and keep only the absolute minimum within super for this reason, I would also make the point that your last sentence can apply to any investment vehicle. Negative gearing, income tax, medicare levies, trust taxation, company tax rates, etc etc etc can all be and have been changed at the whim of politicians.
But history does show that they tinker with the rules for super far more and far more often than other entities, which makes long term planning very difficult in that vehicle, at the very least.