The one that really comes to mind for me is the review of the FFG Star Wars roleplaying game. They weren’t too keen on the dice mechanic or talent trees as I remember, and I know they also weren’t too big on some of the rules and the different rule books. I GMed a 6-month long campaign of EOtE mixed with a bit of AOR meeting on average once every two weeks for a 3-4 hour session, and everyone who played absolutely adored it.
I am not a big fan of DnD simply because I do not enjoy the intricacies of having to know every single spells statistics and measuring numbers against numbers, and having to try to find a very specific skill or ability to do something. That’s why I really enjoyed the system FFG uses for Star Wars. A player can effectively ask the GM “Hey, I think I’d be able to do this under this skill that I have, can I try?” And the GM can look at the skill, see if it makes sense and simply determine “How good are you at this? What might make this more difficult or easier? Does it make sense?” Then you go with it. Knowing that something being of a specific difficulty and knowing exactly how many dice that difficulty will ALWAYS be is something that I enjoy so much more than putting numbers to everything.
I get how some people get turned off by the improv aspect of it, but with my group everyone was always hoping that advantage or threat because they got to decide how the advantage played out in very creative and fun ways, and I got to decide how the threat might up the stakes even when they succeeded at something. Bartering for bonus or setback dice was almost a game in itself. I’m someone who really more enjoys his roleplaying being a story-based experience, and the narrative aspect of the system just checked off so many boxes for me. After playing something that doesn’t require me to go “What’s my skill number, what’s my base stat number, what’s the setback or bonus number I have to add into the number that I need to beat to accomplish something” it’s hard for me to go back when that kind of number crunching just takes me right out of the game. I think that this also reduced the amount of “Well, according to the numbers, I should totally be able to do this thing that breaks the game.”