Contrary to majority, I do not see mulligan change as good thing. I see it as way how to make game more easier, more forgiving, less skill depending, however I admit, that game is still much more skill depending than at example randomfest Hearthstone.
I am fan of "deep-games", where player has to think and mistake is felt, while recovering from mistake is not possible by random event or intentionally benevolent game mechanic. I like chess, I like go.
I made my own Gwent decks, with consistency in mind. As result of that, I put effort into deck building, which was presenting itself not only during gameplay, but also during drawing and mulliganing phase of each round. I do not like this mulligan change, because it is much more forgiving now and indirectly supports "gambling" with allowing to employ "riskier" deckbuilding, which can always be significantly corrected in mulligan phase by game mechanic.
I very much like Gwent for its focus on "deep-thinking", where results, which you get, are mostly result depending on your actions. I do not like mulligan change, because it weakens such factor and is "preventing" "bad luck" at drawing cards, which is not in fact bad luck, but result of your deckbuilding skills.