My experience is mostly positive. I’ve met more than few Croats and all were open, ready for fun and drinking (not saying that all we did was drinking). I like the sense of humor, it’s more often cynical than here. Pretty much same mentality as people here, just replace Orthodoxy with Catholicism when it comes to religious fanaticism on those few religious holidays and that’s it  :D 
And by the way, @Xekoslav my attempts to speak Croatian weren’t always appreciated, although my Slavonian accent is pretty good.