I remember using both Swing and Tk apps on Windows that attempted to replicate a Windows look-and-feel and did not quite succeed, and the uncanny valley effect was strong with those; similarly with Qt apps attempting to emulate the active Gtk+ 2 theme. So being close to native might even be a bit worse than nothing like native.
(Not that it’s impossible to do a near-perfect emulation—IE 5&6, VB 6, and Office 97 all use completely custom widget toolkits, and apart from the funky menus and common file dialogs in Office people rarely complained about mismatches with the platform.)
(Not that it’s impossible to do a near-perfect emulation—IE 5&6, VB 6, and Office 97 all use completely custom widget toolkits, and apart from the funky menus and common file dialogs in Office people rarely complained about mismatches with the platform.)