Well... coming from WoW I can say 2 things.
#1 Blizzard's minimum requirement for gear was realistic and easy to achieve to anyone who puts a minimal effort in gearing up. It made sure you couldn't queue in dungeons where you would have been seriously under-geared.
#2 Players destroyed any use of this by either equiping items which did nothing for their class but were high item level (I have pug way too often with people in PVP sets...) and then also took it too far by requesting that others have ilvl so high they compensate for any personal skill.
Gear check isn't bad in itself. The reaction to it in WoW is what was terrible.
Sadly, I assume players will have the same reaction in FF14 unless they find a way to fix the system.