I remember the sumo being the cute little strider with 2 heatrays and a troll jump, so much so that yesterday I sent one into the enemy base alone and was confused why it didn't do any damage.
Later that very game, I ended up using my sumos to hook the enemy's 2 grizzlies in so my jacks could dildo them to hell. I thought the new sumo's purpose was to use it's gravity guns as a GTFOver here against annoying skirmishers so they couldn't shoot and run.
Onto the next game where the enemy made a ball of recluses. I sent in my sumo with its jacks, except the sumo was slow as ball (cause it is one) and the recluses simply stayed out of range, damaging my sumo until it died.
Onto the next game, the enemy made a grizzly, except this time was smart enough not to let it get close to my sumo. I tried getting my sumo to hook it in, except as both grizzly and sumo move around the same speed, I had no luck. It's short and slow jump didn't help either. Thankfully my ally had reapers close by.
The sumo is supposed to be a 'riot' unit, except on it's own it has no reliable way to do damage. It's only weapon has no real purpose other than anti-skirmisher/anti-heavy, and even then, most heavy units can simply run away when they see it. It's jump range is so small that it can't really jump in range of something trying to run away.
In the sumo's current balance, I can't really imagine it doing anything. I feel we should either make it cloakable so it can surprise unsuspecting heavies, or make it jump farther or move faster so it can catch up with heavies trying to run away.