I think that Ravens are really good, but I wouldn't say they could beat a Titan or Madcat one-on-one if both players know how to use their mech. The Titans main gun does a whole hell of a lot of damage(plus travels quickly and is accurate), it's rockets can sweep across a large area, and if a Raven tried to get close the flamethrower would wreck the poor light mech. The madcat is a bit weaker (lacking the almighty cannon of the titan), but can still easily hold its own.

This is all assuming that the two players are more or less equally skilled at piloting mechs, though.

The guardian is another story altogether though... if you are at a distance or have decent cover they are pretty easy to kill with a Raven (I think Kanako can attest to that).

Oh, something similar to the reverse is fun too. Take a guardian, prep mini nuke, and hide behind a wall. As soon as the unsuspecting light mech walks into view... *BAM*

Thing is, Ravens can outrun Titans and Madcats, easily. The bigger mechs will so easily win a direct firefight in the open, but the hint is to hit and fade before they can see you and retaliate. You can run away if need be; they can't.

Also, don't try hitting a Guardian with Ravens when a moron isn't driving it. First, a guardian wouldn't be caught dead in a place they could be sniped. Those 80mm cannons aren't hard to aim and they will knock out more than 1000 health instantly, then they'd use the flak to finish you.

obviously minigun altfire, it's the most useful attack ever