Right, let's see in detail.
Going by names, the two cards you mention are indeed copies of existing Hearthstone cards:
- Alzur has the same effect of Medivh from the Karazhan expansion (namely his staff);
- Cosimo is a copy of Bogstrok Croaker.
These are 2 cards out of 70 in WotW, a collection where we have more creative design and actual mechanics introduced (interesting ones, not the boring pointslam Gwent was steering towards the past year) than in the past 3 expansions. They are definitely there, and definitely taken from HS, but also definitely far from many. To be precise, quite few instead.
I agree with you about Hearthstone having way too many and uncontrolled RNG, this is exactly the reason I'm here now (I was a day one HS player on a competitive level up till this year, where I had enough of the financial/development model and to some extent the RNG). Comparing today's Gwent to HS however - no, not even near, by a longshot. Gwent is absolutely fine when it comes to random effects deciding outcome.
As for RNG cards, we already had a lengthy discussion in one of the other topics, and I believe it is totally subjective how many rng effects one finds acceptable in an 'RNG' based cardgame. I for one fullheartedly greet some, as long as their effects and overall quantity compared to more tactical cards remains in check and balanced. And they are in absolute check for now. However, I take some of these any day over another batch of mindnumbingly boring "boost +1, damage +2 etc" cards. And I can assure you, there a great many players who definitely enjoy some random effects in cardgames, the same goes for Gwent as well to some extent.
The fact that we have more random cards than we had a year ago holds zero value - as surprising as it may sound, we have more of EVERY type of cards as new expansions are being introduced