The kind of group i want depends completely on what i want to do.He then asked me and others within my linkshell if I would rather have "fun loving noobs" than "hardcore elitists".
Sure, hardcore players tend to be more successful and faster. But when i am a new player to some contend i really hate to get grouped in some elite farming speedrun, where i have no chance to understand what is going on and am completely busy just not getting left behind somewhere and staying alive while obviously contributing othing. Sure, i will get the mission success, but it is not fun.
Now a training run for a hard mission is completely different. One ore several vets, one or several newbs. The group stops several times to explain things and roles for tough encounteres, everyone is patient - that is the best way to learn endgame raids and stuff and it helps getting more players later who know, what to do.
There is also the exploring, flower- snifffing, no-spoilers kind of gameplay. Ideally you want a group of newcomers (for the content) for that with a lot of time. For lack of options (everyone can only be new once) i often end up doing that kind of exploring solo. But if i have to group the last thing i want is some pro who has done it already 50 times, is bored to hell while the newbs take their sweet time exploring and can't even nudge them forward without giving spoilers.
Now, when i am a vet, i want exclusively other experienced players for the boring farming runs but would have no problem with a training run once in a while.
That all said i really really like MMOs with grouping/pug-interfaces where you can use comments and specify the direction your group is supposed to take. The more random the grouping algorithem the more often you get the "wrong" kind of players.
Oh, and of course there are dicks on every level of skill. I have seen a pair of veterans starting and advertising "training" runs in low level content guiding the new players purpousefully into traps strong monster groups to get them killed. And i have seen many new players who can't accept the fact that their gear/build/skill is not as strong as that of vet party members, feel "challanged", try to take extra risks and show off and get themself predictably killed. Or those who lie about their abilities knowledge, get assigned raid roles, have not a single clue what to do and try to hide that fact until the raid obviously fails.
If you are new, please say so. If the experienced players are decent people, they will help you and if not they can at least plan for it and still grab a success somehow.