^That's not what I wrote: not "100% better" - what would that mean? - but "100% of users will benefit because of the content evolution".
Increasingly user-friendly web-apps and better media serving rely a lot on the efficiency of the JavaScript engine of the browsers and on their compliance to existing and tentative standards. That's a fact.
Even users that chose to stay with IE for the time being will benefit in the long run because when better browsers increase their share then web developers have more freedom to create modern web content, and that in turn forces Microsoft to improve their browser. That's why IE5-6 was frozen in a pitiful state for so many years and then MS had, under the pressure of Firefox, to start working again and churn out versions 7 and 8 in a relatively short time.
Plus, even the simple fact that the user is informed that there is a choice to be made and of the name of the options is a step forward. He/she might pursue by asking more savy friends about those options or stay with the former choice, but how is user education bad?
The idea that by having more diversification the user experience might be worse is frankly silly. Do you really think that if we had any monopoly of the One True Browser things would be better? We had that with IE for a while, and while everyone had the same browser as you had, the poor performance and pitiful standard compliance was the same for each and every user because MS never fixed the wretched thing for years and years.
If in all sincerity you can say that since the rise of Firefox to a significant market share things got worse for the users, then you live in a weird reality bubble. If you say that things got worse for the developers then you'd be an incompetent one.
And you'll be able to make an informed call on how good the average user is with computers when you'll have to deal with hundreds of them on the subject. Until them you, your friends and your family are scarcely a statistic evidence, so you better trust someone who works in the field if you reallly want to resort to anedoctes.
