Speed is not adequately included in the team power.  It make it very hard to judge a team based on power alone.  You also have to look at team composition AND power.  Generally high speed teams will have a lower power (In gold IV that is close to 120 power) and judge it based on the team.

If there is an arbiter and a speed buffer; it's a speed team (usually) and the power might be quite low.  Arena is all about speed, ACC, Crit Rate and Crit damage.  Unfortunately we currently have no real guage to tell if a team is built as a speed team, or how well it is built.

They really need to come up with something to use as a metric for determining win/loss.

Things  that  team  power  values  more  of  are  things  that  will  make  the  difference  between  killing  and  living.  For  example,  a  nuker  with  500  speed  couldnt  do  anything  without  damage.  Resistance,  defense,  and  critical  damage  are  the  highest  factors  in  power  as  i  am  aware.

I nptive my own teams show the same distortion when I gain a bonus.Plarium needs toprodiue a better estmate of team power.