Gameplay and announcers are both lacking
The main problem with NBA 2K14 is the oversimplified gameplay (compared with on consoles), making it more of an arcade game than a simulation. You can't call plays, which means you'll mostly be going for one-on-one matchups. Computer-controlled players come off picks occasionally to give you the feel of orchestrated plays, but it's not enough to formulate any sort of strategy. Even when you want to pass to a cutting player, there is no way to pass to specific players beyond pointing the control pad in the direction of the player, which -- on a touch-screen device -- isn't precise at all.
There are also no skill move buttons, making even one-on-one matchups difficult. You can get your players to make dribble crossovers by randomly moving the gamepad around, but even when you succeed, it feels like an accident.
While not relating to actual gameplay, the announcers are probably the most annoying element in the game. When you make a successful shot, for example, the announcer will call out the number rather than the name of the player. So even in the specialized Lebron James content, you'll hoist up a three, only to find the announcer doesn't know the featured player's name: "Number six!" Oddly, the announcer's amnesia goes away during fouls, which makes it all the more annoying that there are no names called during regular gameplay. I also noticed a pretty big bug. At one point Jeremy Lin was shooting two free throws, and after his first, the announcer shouted out "Number six!" presumably from the shot I made the previous trip down the floor (I was playing Lebron James on the Heat). Audio glitches like this one seemed to happen fairly often during many of the games I played.
Is it worth buying?
What all this amounts to is an adequate arcade basketball game that looks good and will provide some enjoyment, but lacks the depth that would give it much replay value. It can be fun to play a quick game with your favorite team if you can get past the shallow arcade gameplay, but it will get boring quickly. In other words, the game is fun, but it sure isn't $7.99 worth of fun.
In the end, NBA 2K14 seems like a lazy port of an otherwise fantastic game, with little beyond being able to play licensed teams and players using basic controls. Some might say it's the most we can hope for in a mobile version of the award-winning game, but to me it needs a little more depth to measure up to the legacy of the console versions.