Ubuntu had an incredible set of ideals focused on doing good for the community, providing a "human friendly" open-source focused distro, and being a great asset to open source. This was in ~2006 when I started using 6.06, I really thought Canonical was doing a great job, what with providing free CD's, providing an entirely open distro, focusing on open software, keeping commercialization low....now they've corrupted into a commercial monstrosity who panders for the profits, and it shows bad. They've gone a complete 180 degree flip from open-source, community focused distro to screw-you-community, ad-spamming, over-commercialized madness in vain to try and force their profits on their users. Well? Screw you, Ubuntu, the users will move to the next open, community-focused distro like Mint while you rot in the dust.
When your core users are technical, open-source, FOSS-minded individuals, you can bet that dumping ads on them will hurt more than it will help. Either it'll be the first thing I uninstall, or if that isn't a possibility I'll ditch your crappy distro for Mint. That's how the open-source world works, if you screw up big time because you become greedy, someone will take your work and continue it with an open mindset. In this case, that someone is the Linux Mint team, and I lean ever closer to switching, especially now with their Cinnamon desktop, it blows Unity out of the water.
Ubuntu's core was providing a solid Debian-based desktop that integrated easy-to-use features for home/personal use. They focused too hard on expanding into non-existant markets (netbook/phone/Ubuntu Android/music store/software store/etc) and now they just look like a street beggar holding their hand out for the users to feed them with ad revenue. Nope, I'm fine, thank you very much, hope you die a painful, agonizing death as all your users realize your corruption and ditch you for a better distro. Goodbye, Ubuntu!