Of course it is in my opinion, every one has different tastes
I could see people finding all versions before stock ICS boring, but now I just can't see how, as the new UI and features are great and far better than any skin now IMO
And the reasons (along with the high res. screen) I mentioned in my previous post is why quite a few people went from the GS 2 to the GN.
Rooting and trying different ROMs is not what android is about, this applies to a very very small minority and the only things, which these offer are;
- customization of the notification bar and the colour scheme throughout the menus etc. the layout is still pretty much the same regarding menus etc. for every mobile running android. Yes new features are brought in as well, but they aren't exactly necessary really
- speed and smoothness, this was very important back in the days when the desire was top dog as android was not very well optimized especially for the slightly lower spec. mobiles, now a days this really isn't an issue, the galaxy S2, sensation, galaxy nexus etc. all are blazingly fast and smooth (when the other mobiles that don't have HW acceleration currently get ICS officially that is, which should be within the next few months). The only other main thing, which is beneficial especially for the HTC mobiles is battery life gain from custom ROMs
- Only a handful of apps require root access and are mainly the apps that can force uninstall stock apps. The only app that I have seen and use, which is useful is adfree
IMO
Android is all about choice and what people want to do with their mobiles regarding 3rd party apps (yes rooting and flashing custom ROMs does fall into this category in some ways but as said it isn't why people solely buy android devices and isn't something that any of the companies advertise either

). If people are bored of whatever skin be it sense, touchwiz or stock, you can simply install one of the many apps on the market to achieve a completely different result e.g.
- want the windows 7 layout, simply install launcher 7
- want the iphone layout, simply install espier launcher
- want a launcher where you can get some cool widgets, which can be skinned along with a ton of other options for customizing the homescreens or app drawer, install go launcher, launcher pro or ADW launcher etc.
Same goes for everything else, your browser, messaging app, music player, widgets, gallery etc. etc.
Personally I hate the current sense versions, far too many features, which never get used and a ton of sub menus, which is why most people think of it as being bloated and laggy, thankfully HTC have admitted that themselves and by the looks and sounds of it, have gone back to what sense was originally supposed to be a clean, minimal pretty looking OS