Team power doesn't mean a whole lot, no. Okay, sure, maybe you don't want to pick a fight with someone 2-3 times your power because it does say something about the raw stats those champions have, but it's all about synergy between your team and countering theirs. I regularly fight teams 50% bigger than mine and win, though more so because they are pretty much all 50% bigger than mine than because I want to. Speed-debuff-nuke teams tend to have very low power relatively speaking, but unless you're tanky enough to survive it or fast enough to beat them at their own game, you'll still die.

Clobbering you how? Are they just faster than you?

Team power can be misleading because you get more power for some stats than others. I also routinely beat teams that are as much as 60k higher in team power. As long as I'm faster, I'm pretty much not worried about the other team's power unless it gets above that 60k difference. At that point, I know they will probably survive my nuke and then I'm in trouble.

Let me get this right.

Your team has close to 85k power.

You have been bullying/beating up on players who have 75k power which is 10k power less vs. you.

You have done this for a while.

Now all of a sudden, The players who have 75k power are starting to beat you.

You have come to the forums upset because you think something has changed.

HA HA HA HA HA HA HA HA

Excuse me for laughing, but it is to funny.

You remind me of my friend.

I'm the only who can help you understand what is going on here.

I am sorry to be the one to tell you this, but something has changed.

It is called "KARMA"

What goes around comes all the way back around.

You have bullied Low Team Power players.

The Low Team Power players have finally had enough.

The Low Team Power players have risen up against you!

You only have yourself to blame.

Why did you attack them to begin with?

Did you think there was going to be no consequence?

You should have attacked people your own power level or higher.

You have pushed the Low Power players into a corner with all your attacks.

They are now trying to come after your Arena Points to get revenge. 

I can't stop laughing.

It's horrible situtation for you, but to me it is so hilarious.

My gosh - you have clearly upset them.

What are you going to do now?

Maybe, you should send them a message telling them you are sorry.

Or put a level 1 hero in your Arena Defense as a jesture of Good Will.

This way they can attack you and get back some of the points you stole from them.

Yeah, they will not be so upset.

It will restore your good "Karma" back.