There is just something interesting about the alien invader movies, but more than often such movies happen to be made on a low budget. And while "Drone Wars" were indeed on a low budget, it was actually a surprisingly nice movie for what it turned out to be. Now, don't jump on the horses just yet, I am not saying that it is a fantastic movie, merely that it was watchable and entertaining enough for what it was given its limitations.
While "Drone Wars" hardly can be described as being innovative or revolutionary, then it does make fair use of an already well-enough established concept idea.
The special effects in the movie were adequate, though you shouldn't set yourself up for something spectacular. I have seen much better CGI effects in other Sci-Fi movies, just as I have seen much worse. So on that account, "Drone Wars" were doing adequately. The effects were there, and they served their purpose well enough, just don't expect a myriad of bedazzling CGI effects.
Now, you might be a bit hesitant about the movie given it stars Corin Nemec, and given his track record of movies, who can blame you? But don't write him off just yet, because this was actually one of his better movies, and he did perform quite well here. And most of the movie was centered on him, so he is in focus a lot throughout the course of the movie, and he managed to carry the movie quite well.
While "Drone Wars" did indeed a generic movie, it still had some entertaining aspects to it and some good moments. So if you enjoy the Sci-Fi genre, and is looking for a light Sci-Fi movie, then "Drone Wars" could perhaps be well enough worth watching.