I didn't really enjoy playing Complex on a rather large, packed server when somehow everyone spawned with prox mines. There was no skill. You would have to wait to see if any mines would detonate, and when the coast was clear, mine the entrances to your area without moving an inch and pray for the best.
It was to my horror when I realized that throwing a mine into a minefield or shooting a weapon or ammo crate nearby wouldn't detonate the prox mines.
I like GES, but I am seeing explosives way to often. Even in 1v1 it's not much fun when you auto-die while looking for a weapon. In GE64 you could at least see your opponent's screen and know where they were placing mines should you be observant, in this GES it's pretty much a simulation as to why historically, minefields are sometimes considered to be a not-so-great idea. Yes, they defend your borders, but after the battle they tend to linger...
GES explosions are much more quick and realistic, too. IN GE64 you could pretty much use mines to build a wall of flames until it got too close and could kill you. This may not be desirable in GES, but there could at least be some lingering smoke to help show where a mine went off.
This is probably just a side-effect of server admins using nasty cvars to do their evil bidding more than a flaw in the mod itself, but I cringe whenever there's 18+ players and I see the text "someone killed someone else with a proximity mine".
Also, I tend to be more worried about the man with a crapload of mines than the man with the golden gun...
Sorry if this seems whiny, but in their current state prox mines detract from the game for me.