Can you clarify what you mean by "game tester"? There are many different types of jobs that go by that name. For instance, there are companies that allow you to be a game tester from home with no training, but it does not really reflect anything about about formal QA.
If you are asking about formal QA, it can be fun! There are many types of QA game testing though:
Functionality - These are people that look for bugs for the most part, such as falling through world, sound not working, art looking weird, etc. This can be a pretty fun job some days, sometimes you are trapped in one level your entire week that you have to play through over and over again trying to find literally everything on the level that can be broken.
Compliance - These are people that look at the game as the eyes and ears of the console developers (Sony, Microsoft, Nintendo) to make sure that the game passes certification and does not have any platform specific bugs. A good example of a compliance bug is a game deleting your PS4 save file if you do something wrong.
Compatibility - These testers are the oens who test PC games on as many different configurations as possible, "looking" for the games minimum and recommended specs. They provide the client with the average frame rate, low frame rate, high frame rate and any specific PC bugs they can encounter, such as if the game does not work with a certain CPU or Graphics card.
Localization QA - These people generally do not translate, but instead they look for errors that are translation related. A good example of this is when text does not fit in the text box its designed for.
There are many, MANY other types of QA. However, because there are so many types, some might be boring to you and some might be really interesting. I personally loved compatibility testing the most because I loved building PCs and I got to do that all day. However, I got promoted and do not regret that one bit.
Hope that helps and feel free to ask me anything else!