Technically, whatever the map pool is, it is the same for every country so there should be no discussion of "balance" in the first place.
That being said, if a map pool consists of only easy maps or only hard maps, it is likely to benefit the weaker countries and the stronger countries respectively. If a map pool consists of stream maps only, it will favor some countries over others. Same thing happens if a map pool consists of jump maps only. Other categories might be high/low AR, high/low HP drain, etc. An ideal map pool should include maps of every category: hard/easy, streamy/jumpy, and so on.
Looking at this week's map pool, I see that it is a bit on the difficult/streamy side. However, there are maps included to ensure that not every map in the pool is harder than the average ranked map, so I think we will be fine.