After reading 10 pages of reaction, here's my two cents.
Earth Goddess: while I can understand halving its faith generation for NFP games, given the Preserve, I don't have NFP and play GS, so this definitely hurts me. At Deity Level generally I'd get a pantheon after most other Civs, so I'd often choose this one, because in the long run it became good. I admit, it was great synergy with the Incas.
Oligarchy & Autocracy: switching the cards makes a lot of sense to me. Oligarchy is now clearly a warmonger government, with combat bonus working together with two military slots. Autocracy is now the more flexible government. I already preferred Autocracy to Oligarchy, despite Autocracy's previous restriction of two military slots; now I'll employ it even more. My main quibble is the names: to me "Autocracy" ought to be the warmonger government, and "Oligarchy" should be more flexible. I'd have switched the other effects.
Monarchy: already I employ Monarchy most of the time for my Tier 2 government, despite needing to choose three military policies. Giving it more flexibility AND giving favor for RenWalls I think makes it overpowered. Okay, MORE overpowered. I never understood why the AI didn't spend more time in Monarchy, and kept switching to various Tier 1 governments. Maybe the AI will employ Monarchy more, and stick with it more, now.
Merchant Republic: I seldom employed this government, and with it becoming more restrictive, I'll do so even less. Merchant Republic's advantage over Monarchy used to be that you could employ up to 4 economic policies versus 2 (and 3 for Theocracy). Now you can employ only up to 3 economic policies with any Tier 2 government. Although I'll admit that one of my favorite economic polices was Colonial Taxes, which is now diplomatic. Note also this weakens Potala's Palace, as who needs 3 diplomatic policies mid-game? If they had also made Triangular Trade a diplomatic policy, I'd feel differently.
Arena and Ferris Wheel: previously, I'd never build these until I wanted to build Zoos and Aquariums. The increase in amenity is nice, but I think the buildings should be cheaper as well. Alternatively, scale the amenities with the population of the city, e.g. 1 per 5 pop.
My favorite Tier 1 legacy building, Audience Chamber, just became better. Although, it's a small enough change, I wouldn't say it's overpowered.