Romantic comedies? I don't know. I like to pitch Annie Hall (and Woody Allen in general to a lesser degree) as one of the good ones but I guess it's not really a romcom. Even if there's lots of romance and I laugh at it.
I do like this one Korean film that got made in the early 2000's. It got an american remake called My Sassy Girl a few years back. I thought it was quite good -the original I mean-, but it's a teen romance so it's definitely not for all tastes. It was one of those plots where you have a shutin boy and a wild girl and then they get together and plotplotplot. Doesn't sound like much when described but I really liked it.
And in the vein of "not great" romantic/comedic films that Il Palazzo mentioned, there's I'm a Cyborg, But That's Ok. It's a romcom set in a cheery mental asylum. Pretty fun/cute/wierd little film if you're into that sort of stuff. Another which is pretty entertaining is Citizen Dog. I'd describe CD in particular as Amelie that's not quite as conventional.
And veering towards the funny/bad film territory, there's Tears of the Black Tiger. It's a western with a neat... I guess 50's aesthetic? It has some good action and hammy acting. Very entertaining if you're into its particular style of execution.