Yes, Polish is very phonetic, and as I said, it's scarier written than spoken. Maybe it's the other way around with English and French.
And Polish is not worse than -let's say- Croatian, and it's Krk island. Krk, 3 consonants, no vowel. Such things exist in Czech too.
But still, when Germans say Stettin, Poles say Szczecin. Kinda trickier.
No, the Polish language is not the hardest to learn since foreigners speaking other slavic languages have no problem to learn Polish.
Actually, I heard Polish is the toughest Slavic language to learn even for other Slavic people. But yes, it's still easier for them, since Slavic languages are very close to each other.
But for all other people, it's quite different. Be they Spanish, Chinese, or Quechuan.
Polish uses the Latin alphabet, but it often almost looks like it doesn't. If you see what I mean.
As I already said in another thread, in Polish, there are like 17 different ways to say the number 2. When there's only one in many other languages (French and English are one of them).
And as a learner, I can tell you how painful this is...