I don't think it's way out of line, but the latest change to various cards wording to be "non-neutral" instead of tied to that faction just is too strong for Assimilate. It was already strong before. It didn't need a buff, which the wording changes very much were for NG.
Last night for example, i had a Dana Méadbh: Provider boosting my NG units in hand that essentially ended up being the main reason my Harmony opponent lost.
Assimilate requires careful, creative thinking to do well. I don't believe it's a "bad" unhealthy archetype.
But right now, it's a bit too strong overall.
Also, this is technically for a different archetype, but on that same note, is Jan Calveit really balanced?
It's too easy to build a deck with 12 tactics and have Calveit ensure you get to play every single good card in your deck.
Assimilate Enslave 6 Tactics is very, very strong…should those two archetypes really be allowed to just pick and choose the best cards from both in a deck where you'll literally get to play every single card you want?
Source: https://www.reddit.com/r/gwent/comments/11zmkun/how_to_rebalance_assimilate/