You're right that Madden, Splinter Cell, etc., would play better with a gamepad. On the other hand it's just silly of you to say that the best version of World of Goo is on the Wii. I own both. There's no room for difference of opinion beyond enjoying the added difficulty introduced by using the Wii's jittery, far less precise controller. Don't get me wrong, I first played, finished, and loved the game on the Wii. It is far superior on the iPad. You have never played it on the iPad and are instead relying on presumptions. Given your historical hard-on for all things Microsoft, I suspect that your presumptions are extrapolated largely from your Tablet PC experiences (or perhaps your Pocket PC or even DS experiences, I suppose). This is a mistake. You need to spend some time with an iPad. What you think you know about it is comically off the mark.
Similarly, your suggestion that the iPad's screen is too imprecise for PvZ makes it clear that you haven't used the device.
Clearly there are many types of games that will always play better on a gamepad than a touch screen. But the converse is just as clearly true. And this is not necessarily limited to mini-games. World of Goo and Puzzle Quest are about as deep as it's possible for puzzle games to be. Moreover, narrative depth can be found in the myriad of RPGs and point and click adventures for the device. In fact, the remakes and re-releases of games like the Monkey Island and the Broken Sword series is a testiment to just how well-suited the iPad is to point-and-click adventures (but don't think the genre is only represented by classics, there is great new work being done in the genre with things like the new Back to the Future and Sam and Max series, not to mention the spectacular Sword and Sworcery).
Btw, as far as phone gaming is concerned perhaps you'd be interested in checking out the new Xperia Play (aka Playstation Phone).
No, now you are making assumptions. I've played around with the iphone/ipad. I don't like them and I don't like gaming on them for the reasons I've described above. I've also never ever tried a windows/m$ based tablet. Tablets are crap, regardless of the manufacturer. When I can get a tablet that has a touch screen as dead-on accurate as a mouse and contains a pc with as much procesing power as your typical pc and has an unlocked os that allows you to freely develop software and install it to the machine I'll think about it, but not until.

In regards to world of goo, you and I have had this argument over and over... for whatever reason, your personal wii setup has issues because you are always claiming that any motion controlled games pointing ability is jittery and imprecise while I can play the same game and it's spot on for me. I can't help it that for whatever reason it doesn't work for you. The game was desgined for you to point at targets with a wand, not click on a screen, this is why it's superior on the wii... you get to play it as intended.
I never said that the touch screen was too imprecise for PvZ... I said that the pc version was MORE precise after you said that the ipad was the best platform to play it on. I also commented that point and click controls aren't really needed for that game anyway.
In terms of depth, WOG doens't count because again, it's a home console game and better suited for the wii (regardless it would fall into my "old ports of games you've already played on a console" category) and puzzle quest... well if you consider that game to have depth then I worry about you.
Yes, so smartphone devices are good for the completely dead and buried genre of point-and-click games, allowing you to play both the sub-par telltale game titles recently vomited onto the world as well as 15-20 year old games the nobody wants to play anyway. So I guess it's got that going for it.

Maybe I should redefine my point this way..... The "games" you are using for you defense aren't really games from my point of view. Yes, of course technically they are and of course there are different genres of games for everyone. When I say games though I mean action games. This doesn't really have anything to do with my game preference, but rather the preference of gamers in general. You would have to admit that the large majority of games people play, both on home consoles and portables are action oriented right? Well guess what smart phones can't do well? That's right, action games. From street fighters, to fps, to platformers to even something as mundane as tetris, when given the choice, you can play a game where timing and precision of movement is required better with buttons and a dpad rather than a touch screen.
I terms of your smartphones you only have three control schemes that work.
1. Pointing and clicking..... this works really well, but the resulting games are really boring and in terms of gameplay aren't much better than the ancient games that came out when cell phones were in their infancy.
2. Non-action based games.... again, these work, but they are so dull who cares? Theya re also unpopular, not by my opinion but by the majorities.
3. Tilt-sensor games. These work fantastic, but the fact that the screen tilts when you tilt the "controller" hurts gameplay somewhat. I know some of the racers on the ipad look like they would make me sick to my stomach.
And keep in mind, I'm not arguing with you over which games are "better" or anything, I'm arguning over which games are more popular and over which games gamers will purchase a system over.