They say that about English, too (but we have all these rules, exceptions to the rules, and even exceptions to the exceptions, take the word weird for example).
I have seen some vlcak paperwork so I'm under the impression the language doesn't like vowels too much?
BTW - what is the Czech language based on? It doesn't seem Latin based like Spanish, French, and Italian and it doesn't seem Germanic based like German and English.
Maybe Russian based, or a combination of languages (like Creole)?