To be honest, I was slightly against Garchomp being banned since I do know of ways of beating the thing, regardless of how "unbeatable" some have claimed it to be. Saying Garchomp is unbeatable is an outright lie, however I've tested the thing competitively and it is far, far more dangerous than the Regis and the Lake trio, and has the potential to wreak far more havoc on a team than Latios and Latias also, since Latias is more of a defense/supporter type and Latios can't match Garchomp's insane damage output without Choice Specs, and the potential flaws with using a Choice Item should be obvious.
In my experience of using the thing, I've found that Garchomp is essentially an "I Win Button" against anyone who I've battled who was unprepared for encountering it, and even against those who I have battled against with the thing, it has almost always ended up being the Pokemon that landed the final blows to finish my opponent off. That and its horrendous overuse are the main reasons for the ban, although the circumstances around the "official" ban itself, not the ban done here for the tournament, have been extremely dubious and questionable from what I've seen.
You may not like it, but the general consensus is that Garchomp is too strong for OU level play when used at its maximum potential (Swords Dance and Sand Veil out the wazoo and Outrage for game, essentially,) and that's not going to change. Also, don't call something "stupid" when you don't even have a good argument against the ban - for the most part, it just seems like you're complaining because your best Pokemon can't be used here.