Sure would be bad if I also mentioned Samsung's music player with a 10-band equalizer and Music Hub, the streaming music service for people outside the US and Google Music territory, and Samsung's video player which plays back just about everything with hardware acceleration including mkv container files and even supports softsubs, and Samsung's stock browser which is by far the best of all stock browsers.
People like to slag S-Voice but don't realize that while Google Now is great for voice searches, it can't be used to control the phone itself by voice command which is what S-Voice is for. I would be remiss if I also didn't mention S-Note, which seems awesome on the Note and Note II but actually is available on the S III (and S4) but with finger input instead of stylus input for scribbling out quick notes to yourself. Then there's S-Planner, the calendar app which integrates with Google Calendar and offers impressive features including a full-pane widget for a whole month at a glance.
What about AllShare, the DLNA media streamer app which lets you stream videos and music from your phone to any DLNA-compliant device like a computer running Windows or a DLNA-capable receiver? If you don't want to fuck with DLNA, Samsung has always led the way with MHL and your phone works with a USB to HDMI adapter for direct connection to any HDMI output like a TV.
Then there's the stuff that Samsung actually adds to the Android OS which you can't get anywhere else, such as Multi-Window which lets you run 2 apps at once in split-screen. Only Samsung integrates stylus input at the OS level, which is why you can use Air View to hover over objects to preview them in the Gallery with the stylus on the Note II and you'll be able to do it with your finger on the S4. Of course TouchWiz is famous for the Notification toggles which many people (including Google) have copied, but nobody has gotten to work as well as Samsung has. And then there's Page Buddy, I love how when I plug my headphones into my phone it whips out a new hidden home screen pane which I can keep my media player widgets on for instant access to playback. When I pull the S-Pen stylus out of my Note II, it whips out a pane which shows me my S-Notes and gives me instant access to start a new note page.
Oh right, and while I'm busy gushing. My phone has a microSD slot and a removable battery too. Apparently they are selling 4000 mAh high-density batteries on eBay which fit into the same space as the 3100 mAh battery my Note II comes with. I'm thinking about getting one of these monsters for even more juice because I use my phone so much to play this game I'm addicted to, I put in about 8 hours of Screen On time from the moment my phone leaves the charger to when it gets plugged back in at night and I'm actually killing my battery by then. I wonder how long other phones would last with the kind of usage I'm hammering my phone with. They would probably be dead halfway through my day.