Ok, I'll be more specific: I hate the tools I have to work in JavaScript. No code formatter, autocomplete, syntax check, debugger. JS is a pretty sophisticated language with some things
Java can't touch; with the right tools I might be a fan.
GWT might be the kind of tool that means I rarely even look at my JavaScript. Buggy doesn't surprise me; it's beta. If Google starts using it to build their own sites I might be confident enough to use it in real life.
I loved my old cars with no disc brakes, no air bags, no anti-lock brakes, punch-through-your-chest steering column, bias ply tires and a solid steel dashboard, but I'd rather drive my boring Subaru with a few safety features day in and day out.