Yeah, some people don't like change and didn't like some of the core changes but for me, Civ 5 is by far the best iteration of the game and even today, years after release, when I check http://steamcharts.com/ Civ 5 is still one of the top 10 played games - every day (47k users as of this posting), along with selling roughly 7 million copies as of a year ago (http://www.gamespot.com/forums/system-wars-314159282/civilization-v-sold-over-7-million-copies-on-pc-32084533/), so apparently a lot of people disagree with you.
50k active users/day 6 years after release and 7m copies for a strategy game is pretty sick and doesn't happen to "ruined" games.
That only shows it's popular, not good.
A lot of people don't like Civ5 as it went more tactical then strategic. This is valid.
A lot of people like Civ5 as it went more tactical than strategic. This is also valid.