When joining a group there seems to be no way to determine the group quality or what world difficulty the group has been formed in.
I have no problems as a 40-level 2200+ SHD character joining a sub-30 group if it helps the sub-30s do a mission faster or some other task but I DO find it annoying when I join a group to find that all the players are level 40 and SHD 300+, 1000+, or even 2000+ and they are STILL playing on normal or hard. It is a waste of my time to even bother as the loot collected will be inferior, the XP gained will be minimal, and the resources gathered will be less.
If these pansies want to run about kicking fidos that is their choice but if there was a way to see what the group was about before accepting a join it would be very helpful to the joiner. ESPECIALLY as the joiners world resets when they leave a group - control points default to world settings and no convoys, or hostage, etc. If a player declines to join a crappy group their own session is not reset as a result.