In the contrast of being completely blunt, "is Civ V a good game" depends on what you wanted in the game. Is the game better than Civ IV? The short blunt answer?
No.
Is this game worthwhile? Absolutely. There are some things they did actually improve in this iteration than they did in VI. Warring has be slightly little tedious (abet, still very tedious) in this game than it Civ IV. The interface is a lot less crowded, and the tech tree has been better done (seriously, when were Riflemen ever considered a industrial era unit? That's a renaissance era unit historically!), and how the buildings have been revamped were beautifully done. There are things I really wish should have never been removed or changed from Civ VI to Civ V, like religion and the Civic system. Nevertheless, I find myself playing V and enjoying it as well.