The strength of Maemo/MeeGo is that you can use more than one language and toolkit, which is great for developer choice.

Qt and GTK+ are "toolkits". If you are a bad craftsman, it does not matter how good your tools are. If you are a good craftsman, you can create good results even with suboptimal tools.

It's not about Qt vs GTK+, it's about good and bad UI design.

Of course, if you want perfect platform integration (and the right widgets), you have to go with Hildon for Maemo 5 (plain GTK+ is not enough to make your UI fit in well) and if you want perfect integation into Harmattan, you have to use DUI (again, plain Qt will probably not be enough).

Say NO! to negative threads like this one. Invest your time in making apps better. You don't have to be a developer for that.