Great feedback @SpectralPhantom, I second the point you made about map size. I didn't provide feedback back on this when I did my initial testing of spawns (mostly because I was solo, but using multiple accounts), but now that I see other players mention it I think it is important to note my concurrence. Large maps certainly force a different 8v8 playstyle (as you point out with the Eden arena map), such that spawn location becomes central to affecting the outcome of match due to the proximity of the ongoing spikes. The larger a map gets, the longer it could potentially take for players to get back in to the fight.
Conversely, to any organized PvP teams out there: perhaps these larger maps would benefit teams who use team teleport related powers to assemble/buff? Does Team TP work before the timer ends?