I have MLB.com too. I found this kind of annoying, but here is a little trick

If you load one of the tv media player pages on a normal desktop/laptop computer (that doesn't have silverlight installed) you will notice a banner that says something like "Use original media player" (or something like that). However, when you load that "tv" window on the tablet, you don't see it. The problem is that MLB.com uses a fixed size for that window, so if you don't have a screen big enough, alot of the elements overlap, and you can not see that banner (to use the original player). HOWEVER, if you zoom way in on the tablet (I had to zoom to 240%), you will be able to see this banner. Once you click it, you should be presented with the interface you are used to It is annoying and clunky, but it works... I hate that you have to be so fast in copying the url too... It usually takes me a few times before I can get it to work.

Another little hint... Because video is so choppy, I usually convert the stream on the fly using vlc media player. If you have a spare internet visible computer somewhere, it works pretty nice. I have VLC installed on a server, and then I copy the URL into VLC's web interface, and then convert and serve that stream on my server. I then point mplayer to that stream on my server, and the things plays pretty smooth... NICE I haven't done this in a while, but if you are desperate, I may be able to dig up more details.