Somewhat enjoyable Euro-Schlock The Swarm is definitely not a good show. Horrific acting, laughable dialogue and amateurish writing make watching it downright painful at times. On top of that it might be the worst adaption of a book I've ever seen on screen. Still, you might be able to enjoy it if you've got a soft spot for bad European television.
Among all the issues that plague the show, poorly written dialogue und bad acting are probably the main offenders. A lot of the scenes are just actors who cant be bothered to act reading stilted and boring dialogue thats chock-full of exposition. Were definitely in B-Movie territory here and the few good performances we see aren't enough to save the show. The creators also did a bad job at adapting the source material. Pointless stuff is added, important characters removed and nobody could be bothered to properly update the 20 year old technical aspects from the original book. It basically feels like a bunch of semi talented individuals got together to burn film subsidies without any passion or creativity. Yes, it's that bad.
Yet you might be able to enjoy the show if you want something to make fun of while digesting your Sunday dinner. There's a tradition in Germany to watch a mediocre crime drama called "Tatort" every Sunday just to hang out with friends and make fun of bad TV. The Swarm is hitting that exact same spot. Sounds good? Then cozy up, grab a bag of chips and gently doze off while watching a global desaster you couldn't care less about.