It's a good job, but don't be fooled... the pay is low, the hours are long, and it's very very tedious and repetitive.
Playing a game and testing a game are two very different things. First of all, I have no choice in what to play. Second of all, I have no choice in what I DO in what I play, and what I do play usually ends up being the same thing for about 2 years. Logging 6000 hours in a single game kind of kills it...
As far as your actual assignments, essentially, they sit you down and go "This is your assignment for the day" and you do it. That assignment could be a million things, including something as boring as "Sit here and reload this save over and over, killing this same creature, for 8 hours."
Also, it's not like I get to start a game and keep a save all the way through, playing along until I beat a game. I might restart dozens of times in a day. I might play a game for 6 months and ONLY ever see the first 20 minutes of the game.
Do I like my job? Sure, I love it. I'm around video games all day. However, it has it's major flaws, and is not as fun as it might sound. Just something to think about.