Takedown is a fun tactical game but it does have flaws as of now.
I'm sure all of you are aware but TD (that's how I'm abbreviating in) is not a run-and-gun game, it is a tactical shooter that requires individuals and teams to use tactics, special equipment, and patience above anything else. If you move slow and take deliberate actions you're likely to succeed against the difficult AI-- if you play it like CoD or CSS you will rage-quit and never play the game again.
The game is playable but has has problems with the interface, connection problems (currently using a program called Evolve to network), and some minor in-game issues. Basically, the majority of problems are how you select things, how the things you selected didn't get selected, and how someone thought that it was a good idea to have such a crappy UI.
In regards to SWAT 4, TD brings back a lot of joy from that game but makes you miss things like tasing old ladies, spy cameras, door stops, and the helmet cam feature. However, word on the street is that modders are already working on recreating SWAT 4 maps for TD.
TL;DR Fun game with problems. Still a fun tactical game. Buy it anyways, it's like $15 you cheapo.
P.S. A good chunk of the Op:X Arma crew have been playing TD for the past week, we know it has problems but it's a fun game that makes you play smart.