*This bonus will only apply to monsters that check as "even match" or weaker to the player.
This is one of the biggest reasons I don't think it will really matter. And seriously... the numbers are pathetic. If you've got a group of 3 you only get 10 bonus XP... a group of 4 gets 5 bonus XP. These mobs will be unchainable (unless you start with a T). So a small group killing these is heavily crippled. They are getting a nearly non-existent XP bonus to kill mobs much more slowly and with marginally less down time. A 5-10 XP bonus per mob that you're killing very very slowly without chains is nothing when you need 6-10k between levels.

It would probably be more beneficial to hold out for a real group. If they'd not put the cap on EM mobs it might not have mattered as much, though can a group of 3 take on T-VT mobs consistently without death at low levels?

At best we'll be seeing groups of some of the 'lol tier' melees subbing WHM and making these pathetic PTs because they can't get normal invites. So probably DRGs, THFs and DRKs can join up with maybe a SMN to go pull in crap numbers that are only marginally preferable to LFP.

I'd personally rather leave my flag up and wait for a real PT than slave away in a crap one for tiny XP/hr.