Avoid Baron

One thing I've noticed in normals is that, even if you get the baron, it's a huge waste of time. When the score is 40 - 40 there is no point in getting Baron because most of your team is probably going to lose it before it makes a real impact.

If you miraculously pull out of a TDM with an Ace, GO TO THE INHIBS. You need the super minions to push the lanes for you instead of getting Baron and doing it yourself. If you get an inhib(s) and still have time to kill, GO TO DRAGON. Dragon gives you stats, and eventually Super Saiyan which might help you survive the next Deathmatch.

If ther'es nothing else to do, then do the Baron.

This will change depending on how your team is playing, but in those Deathmatch style games where nobody has a clue, this should help you win more.