I see two faces of the coin here: When I heard the Czech song for the first time weeks before the rehearsals I thought it was surprisingly good, but will have difficulties to qualify because there are many similar (and maybe slightly better) songs in the contest. Also Czech Republic does not seem to have the sufficient support from Europe considering their previous ESC appearances.
On the day of the first rehearsal most of the worries seem to disappear, because many people from the media found the rehearsal outstandingly good. Here in the forum Czech Republic went from "typical losers" to "sure qualifiers" in only a couple of hours. Well, I want to say that the truth is probably somewhere in the middle: The chances of the entry are not as bad as people thought before ESC but they have not risen as extremely now after we've seen only a few seconds of the rehearsal.
By the way, that's generally one thing that bothers me a little: For every single competitor who has his first rehearsal you can find at least one user here who finds it absolutely great and thinks that it is "a sure qualifier now". According to the forum and other press reactions, significantly more than 10 countries per semifinal would progress to the final. But OK: people are enthuiastic about their favourites and the whole ESC, so am I. Who can blame us?
But one last positive aspect concerning Czech Republic which I noticed yesterday evening when watching some more youtube-footage: Marta and Vaclav did a very good job at the "meet & greet" press conference and other interviews: They appeared self-confident without being arrogant told some interesting facts and some funny stuff (remember "kick Czech Republic's ass", I laughed so hard). Let's see what the semifinal brings.