When Nintendo releases DSi without previous gen games compatibility (unlike DS) it's the best hardware ever made.
It's not the best hardware ever, but it is an improvement over the DS Lite in enough ways to justify its existence. More storage, SD card slot, cameras, etc. It can't play GBA games, which were obsolete years ago. Oh noes!
Proprietary cable for on iPod? It's Apple, stupid!
First, the cables aren't proprietary. They're standard USB cables with one proprietary connector. The other connector will work with any standard USB port. Second, no one praises Apple for doing this, it's just that the benefits of the iPod outweigh the drawback of needing a special connector for it.
Downloadable games - all kosher for Apple, Microsoft and Nintendo.
I can still play disc-based games on my 360 and Wii, and I can still play DS games in my DSi. As for my iPod, there were never physical media games for it otherwise, so who the fuck cares? The issue isn't downloadable games, it's having to pay to download games you already bought for the previous iteration if you want to play them on the new one. So far, I haven't had to re-buy any games for my iPod Touch or 360.
Sony, on the other hand cannot do anything right - UMD is lame, no UMD is atrocious. What do you want,a 8" floppy? A DVD? Does your Zune come with one? Your DS? Your iPhone?
If you want to play games from UMDs why do you buy PSP go? You don't buy an iPhone to play your Appple ][ floppies. You don't buy Zune to play MSX carts.
That's a red herring.
I'd rather buy downloadable games for PSP since I can install them on multiple PSPs and PS3s than buy multiple UMDs to play multiplayer but I must be a crazy one.
If you sincerely want to to that, knock yourself out. You are one of the rare few with an interest in the PSP Go who isn't getting shafted by it by making you have to re-buy your games if you want to play them on it. By all means, enjoy your handheld that costs more than a brand new console.