Candy Crush is basically this: line-up stuff to clear lines and make sure you don't run out of moves, otherwise it's game over. And it's just that. Do it again, and again, and again, and again. It gets... so... so... BORING after sitting down trying to actually play it through. This game is good for pass time on the train or a bus, but by no stretch of the imagination does Candy Crush qualify as a 'good video game'. It's a game of luck: not logic, just how many taps you can make to pass the level.
Oh, and this game is freemium. A definite no no for hardcore gamers. I don't identify as 'hardcore gamer' necessarily, but I do love my dungeon-crawling in Zelda, my platforming in Super Mario, my James-Bond-ing in Goldeneye 007, my secret agent adventuring in Perfect Dark and Metal Gear Solid, but never will I consider redundant tapping in the same league as 'video games'. Candy Crush isn't even a real video game. It's a finger luck-based tapper.
Pretty colours + redundant gameplay = pretty redundant.