Well i must admin that multiplayer in FSX is very great.First of all , playing my 10 game since getting the game, i have never experienced any lag (depending on the server of coarse) second i just love the tower control. Everything becomes so realistic.Here's a shot i took while surveying the airport from possible hijackers or terrorist actions. I usually fly a chopper multiplayer so if you see me buzzing in front of you, don't be alarmed it's just standard procedure i help the tower manage the traffic ;D

In the conclusion i must say that surprisingly FSX multyplayer is ALOT of fun for me.