@ Karim Bourouba
I suspect we may be talking past each other, but I also think it's clear we wanted completely different things from our devices.
I wanted a full-fledged (albeit known to be limited and low-powered) pocketable computer that I could use as a reference library (I even installed the hardware hack to use full-sized SD cards), web browser with competent ad-blocking, email terminal on the go, note-taking device, pocket calendar, and hey, linux in addition. Except none of that is worthwhile with what I regard to be the wretched built-in software, most of which is not readily replacable. Also, I do know that Hildon is just the window manager, and I muck around with my own linux box plenty... but I found a much more tangled mess of dodgy wiring under Maemo's hood than on my Ubuntu box's. Not to mention the crash-proneness.
For phone stuff, I have a Nokia N82, which lacks meaningful ad-blocking, a usefully-sized screen, and a QWERTY keyboard, but otherwise, ironically, is far more stable and useful for many of the tasks for which I wanted the N810. There are pieces of readily-available software that, other than ad-blocking, just plain perform the tasks that I desire, and do them without a whole lot of irritating and seemingly random crashes and resets.
So from where I'm sitting, I don't see why there's hate for S60, possibly for the same reasons you don't see why I hate Maemo: S60 appears to perform as expected and required for my purposes, Maemo didn't. I get the impression that for you, and possibly lots of others, the opposite is true. So it goes.