I'm a native Greek speaker and to my ears all European languages' vowels are weird with the exception of Spanish, which is completely normal. All those airy sounds: caaat dooog, haaaaouse, taaaaime, etc like a little fish trying to eat a much bigger fish. Let me not start with French, or Italian. Conversely, when I hear myself or another Greek speaker speak English it's like there's a little guillotine in the back of the neck that snaps shut just when a vowel is starting to form: c't, d'g, ta'm, etc.