I'm in Scotland and I have experienced one or two issues, I find multiplayer in Halo 5 to be very balanced.You are probably really lucky to be put often on the two-three eu servers that spawned sometimes (or you simply play on US servers and do not notice it).
Here, on reddit, on NeoGaf OT, and over the web is full of complaints from EU customers about this server location issues.
All reporting same happenings, some with proofs. I have now x488 assist medals lol
Fair enough bud, but I can only report facts, I would say I'm fair to average player, I've been playing Swat, I'm about 1 KD, I have 1800 + kill, 1800 + deaths and I'm about 50 % wins lone wolfing it, it seems fair to me, and I have 187 assists, not sure if that's good or bad, but I will admit, playing Titanfall on EU servers I do better, but it's also a different game. Hope this is of assistance to you.