On decent level, yes. Most english-speakers drop when they can't tell the difference between "ш" and "щ", can't spell "ы", don't know what "ъ" is used for.
Also grammar is more complex. Words must be written in many different ways depending on their tence, grammatical case, gender (all words have gender), perfect or imperfect verbs and what not (I don't even know English terms for most things since English don't have these features and those words used only by linguists)