RE: PokeBeach's Official Ban List
I see why people would want to ban Excadrill. On paper, the ability to get up to +2/+2 in one turn with immunity to two forms of status seems broken. But here are a few things to consider:
Excadrill's movepool boils down to QuakeSlide + bad coverage. It can choose X-Scissor to hit Virizion and Bronzong, or Return to hit Gliscor. It is usually outright walled by something.
Most decently bulky Pokemon can take on Excadrill if it doesn't have the SD boost up. Bulky waters, in particular, can take a hit and threaten with Surf or Scald.
Excadrill is pretty weak to priority, especially in the form of Mach Punch, Vacuum Wave, or Aqua Jet. It also doesn't take STAB Ice Shards from the likes of Mamoswine and Weavile (lol) especially well.
In short, Excadrill is a great Pokemon, and it is obviously one of the best sweepers of all time. However, it has its counters, most of which are pretty common in OU, so I don't think it's broken. I think that's probably why it hasn't been banned in any of Smogon's suspect rounds so far. Of course, I'm not the best battler on the site, so I'd like to hear the opinions of some more experienced players, but I think the common consensus is that Excadrill can be contained.