The problem IMO is simple the game for some can be solo'd all the way to the end, and for others regardless of their build can not. Now this can come down to any number of reasons, play style being the biggest of those IMO. Another problem I've encountered is the how I want to put this, seemingly unleveled elites. What do I mean is probably what your asking yourself, what I mean is simple. (Yes I understand elites/champions are supposed to be more powerful than the player ever if its the same lvl as us) but I fought three sith "harrowers" on Tatooine that were level 32, while I was level 33. I spoke out in general chat and after a days time I got some help, then went onto Nar Shadaa for the bonus series and my companions quest there. and worked over three sith apprentices, elites as well no problem/ They were exactly one level below their predecessors.
Now your probably thinking why didn't this "troll" just get help from a guild or join one, first off I am in a guild. A guild that the majority of its players came over from STO. But IMO it is becoming kind of eliteish, which makes grouping near impossible and will probably kill the guild before long. It is my thought now that perhaps other guilds are having this same issue?