Russian grammar is inflectional, yes, but that's about the only difficult part of the language. It is not that different from German in this matter.
In addition to noun inflection, verb aspect, pronunciation stress, and punctuation trouble many native English speakers. That's in addition to all the simple irregularities, like irregular nouns and verbs.
Stress even troubles native speakers. When I lived there, I saw slideshow "where 's the stress?" quizzes used to fill time on screens in taxi buses, waiting rooms, and the like.
Punctuation is secondary, just put commas, colons and semicolons where you feel they should go, most Russians don't know any better themselves.
Noun and verb inflections you will master with enough practice, yeah.
Maybe overall a more difficult language than English or German, but not in the same league as Chinese or Arabic, in my humble opinion.
vunderba•26m ago
For anyone looking to study Russian, I highly recommend spending a few days familiarizing yourself with Cyrillic first. Toss it into an Anki deck (or download one) and use FSRS (Free Spaced Repetition Scheduler).
It’s phonetic and consists of only 33 letters, I memorized it on a ~12-hour flight to Moscow many years ago.