I'm going to take the dissenting position here, and say that the Balius isn't "teh suck" as many might think. The Primary configuration, and alternate configurations Bravo and Charlie, are damned useful in a heavy mecha-cavalry formation. The aforementioned configs have got the speed, level of armor protection, and weapon loadouts to fill that role remarkably well. The quad chassis also offers a few perks with the design.
I don't know about the games of others, but in our gaming the cavalry is about high mobility warfare. Stay on the move, strike fast, and hit hard. The problems with the Balius begin when one tries to play it as a typical line heavy. It's not a design that lends itself to heavy maneuver combat very well. It's all about haulin' ass, not getting glassed.
I have a huge appreciation for fast heavies like the Balius. When things go sour, and it suddenly comes time to make like horse shit and hit the trail (no pun intended), it's less of a headache to get them off of the mapsheets than with the typical line 4/6 (and to a lesser extent, 5/8) heavy units. The faster you complete your tactical withdraw (aka: retreat after a major SNAFU), the fewer rear guard units you lose.
Finally, considering the role we use it in, the look of the design is very appropriate. I know that pretty is as pretty does, but the thing just looks damned cool. This is probably the closest a 31st Century cav pilot is going to get to the horse cavalry of the past. Spiritual successors and all that.
Anyway, that's just my take on the Balius. I like the design. It's worked well for my group.
And as always, just my two cents worth.