When I was looking at different Master's programs, I went to a class while visiting and had the same reaction. After receiving some very wise counsel (from my mom, go figure), I realized that I sat in on ONE class. Maybe the Prof. was having an off day, or perhaps you ended up visiting a class where the student mix wasn't so great, maybe they made the material seem much more boring/pretentious/etc. than it really was. You just have no way to know. In my case, once I considered it, I realized that even if the content of ONE class made me feel blah about things, the years I spent preparing for the MA had inspired me and made me even more interested in my field. You have to take a leap now and then.
Fast forward to now: I am about to sign onto a PhD program. I have also had serious doubts about it, partly because I'm not too thrilled with some of the intro classes and theory seminars I will have to take. However, I have now realized that I have to work through those courses with the unappealing material to get to do the research I'm really excited about. You may not be thrilled with all the material you have to cover, but keep your fun, free-wheeling post-courses media studies aspirations in mind. It might be worth it in the end.
Finally, on law school. I think the points made above about how something new and fresh can be tempting are completely true. However, think very carefully about law school. There are many, many reasons not to go (higher incidence of substance abuse, depression, and divorce among lawyers, for example). I was thinking about it at one point and my brother (an unhappy law student himself at that time) sent me a huge article that convinced me to nix the plan. If I find it I'll post a link. I wouldn't rush into it, and I would definitely do a lot of research. In case you're thinking about being one of those "save the world" lawyers, read A Civil Action first (don't see the movie, though. not as good). However, if you're really interested in law, maybe you should look for a way to incorporate that interest into your media studies research. My brother is always complaining about how law is represented in TV shows and movies, and I think there are studies now about how media representations of the ease of moving criminals through the judicial system (think shows like Law and Order where the criminal always confesses in the end and gets sentenced within a few weeks of arrest) have been creating ridiculous expectations among juries and the general public and then affecting the outcome of cases, or even attempts at judicial reform. That's just one example. There's a lot of room to combine your passions without getting a law degree.
Best of luck to you!