There are 2 points here.
1) It's perfectly reasonable to tell others to "give him a chance", "it's only 3 games in" etc etc etc. HOWEVER, this doesn't mean that (predictably) you should lie about what a great contribution the guy is making. He hasn't so far. Early days though and doesn't mean he won't.
2) You sound like a complete tool if you TELL others that this guy "will be the best midfielder in the PL" and other similarly outlandish statements given that there's no doubt at all that over the last 8 years you haven't seen a single kick of Ukrainian football and subsequently haven't actually got a clue. One tie against Chelsea (of which if you're honest you've probably only actually seen -like me - the goal he scored) is not enough to judge whether he'll be a success. If you think it is then have a word with yourself.