So what you are essentially saying is you'd rather play with one side of the coin. Let's just play in a metagame where physical attackers can run wild and limit the special attackers because it's easier that way (let's not forget that it makes the OU metagame much smaller and it means we can cover all the threats effectively too!!).
Neutrality =/= one of the best in the game. Especially considering that you are always trying to do the most damage possible.
"Guessing right" is just to avoid losing one pokemon. At most you should never lose more than one pokemon to Garchomp unless your opponent has outplayed you thoroughly and youre entire team is weakened and/or slower than Garchomp. Again, you just fail to realize that all of its potential counters will cripple it if it stays in to try and kill them. So they lose their most potent attacking threat and you just lose the pokemon that was there to counter it in the first place. You are, if anything, in a better position than when you started because his best offensive threat is gone while all you've lost is your counter to it which was designed to beat/cripple it in the first place. Duh.
Again, it's not overpowered especially since its counters end up crippling it anyway unless you've been outplayed and I already mentioned how that puts you at a more advantageous position anyway. I don't know about the OU tier shrinking because I haven't been around for a while and I don't know what marks the cutoff in usage for the OU tier.
Dragon's neutrality combined with extremely reliable accuracy makes it a very potent attack type. Even if it doesnt always have the advantage, it never has a disadvantage.
Neutrality =/= one of the best in the game. Especially considering that you are always trying to do the most damage possible.
If you guess its moves right, you can win. Sure. But I would rather not be forced to rely on guessing to win.
Introducing a pokemon that can beat all of its potential counters is much different than having so many pokemon that countering all of them with 6 is next to impossible. I don't know how you could even make a comparison like that.
"Guessing right" is just to avoid losing one pokemon. At most you should never lose more than one pokemon to Garchomp unless your opponent has outplayed you thoroughly and youre entire team is weakened and/or slower than Garchomp. Again, you just fail to realize that all of its potential counters will cripple it if it stays in to try and kill them. So they lose their most potent attacking threat and you just lose the pokemon that was there to counter it in the first place. You are, if anything, in a better position than when you started because his best offensive threat is gone while all you've lost is your counter to it which was designed to beat/cripple it in the first place. Duh.
The fact that it cant be countered isn't what makes it overcentralizing. That is what makes it overpowered. The fact is that Garchomp is literally overcentralizing by taking up more and more of the 75% cutoff mark in determining OU status. The overcentralization is supported by the fact that the OU tier is shrinking (it is now down to 45).
Again, it's not overpowered especially since its counters end up crippling it anyway unless you've been outplayed and I already mentioned how that puts you at a more advantageous position anyway. I don't know about the OU tier shrinking because I haven't been around for a while and I don't know what marks the cutoff in usage for the OU tier.