I concur that the Marina change is concerning. For a card that was reasonably playable, I was surprised that she was changed at all (compare Liand, who was "fine"). Likewise, she was the only card that received a significant change other than maybe Firestarter, and Firestarter doesn't seem that much better to me.
So Marina, a factionless legendary who didn't really need a buff, got a massive buff. Big deal, right? Well, except for those two descriptors: factionless legendary. Having chase legendaries or epics or whatever in the game is fine, it sells packs, I get it, but having them be factionless and therefore playable in every deck--and a card like Marina is good enough that almost every deck will want to play her, much like Martyr Golem--brings on allegations of "pay to win." Now, IW isn't pay to win, not yet anyway (and hopefully never) but this development is troubling. Recently MtG banned Smuggler's Copter and Emrakul, the Promised End from Standard because they were powerful cards that were colorless and could be played in any deck--such powerful cards that if you weren't playing them, you were inherently disadvantaged. Emrakul was the best top-end card out there, better than anything else, meaning playing other cards was a mistake. Likewise, Smuggler's Copter was an insanely good low-drop. Both were colorless and were warping Standard to such an extent that WotC made its first standard bans since Jace the Mind Sculptor and Stoneforge Mystic. In much the same way, having top-end cards be factionless threatens to remove diversity from IW, since those cards can go in any deck and crowd out faction-d cards. People have said in the past that Calamity and Martyr Golem are OP and pay to win cards--adding Marina to the list of high-value factionless cards will not help IW in the eyes of its accusers.
And the bugged nature of Marina! Even with her "over-buffed" by the bug that fails to remove untouchable upon her death (which, as I just checked, is still there), I would be more or less fine with the change and would willingly wait to see what happened if the devs would at least disable the card until she got fixed. Yet as you said its been a week, the hotfixes don't appear to be working (if they're there to fix Marina), and she's still bugged and still enabled. The fact that she hasn't been disabled from play is, in my eyes, one of the most disappointing aspects of this whole affair.