Let me start off by saying that a good part of this might end up being a rant, but I'll go ahead and outline what the important part of this is for those who don't want to read a tl;dr.
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Some leves, in particular the defense leves, need to be further adjusted so they are not in a field of aggressive monsters. (In particular Efts because their aggro range is broken.) For a party it isn't much of a problem, but since leves are being designed for solo players, I'm narrowing this thread to a solo perspective only. It is not fair to solo players, who have no one to resurrect them when they die, to have to fend off the defense point from regular monsters instead of their leve targets. Regular monsters are much beefier than leve mobs, and make the situation very frustrating. Efts in particular are broken when SE removed the curiousity aspect (for who knows why), their old "detect" range was substantially larger than their relatively small "aggro" range and when curiousity was dropped their huge detect range became a radial aggro field.
Disclaimer A: This comes from the perspective of a Gladiator, which is one of/the least squishy classes at the moment, and is specifically designed to handle multiple monsters. I don't know how other classes get by...
Disclaimer B: I understand this is an environment full of hostile monsters, and part of the tactical aspect of this game is avoiding aggro from monsters. But being forced to stand in a hostile area for five minutes fighting monsters is not tactical, its just stupid.
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Rant:
As a gladiator, I'm not squishy so I generally have little problem with leves and the fact that I have issue with this then it must be completely impossible for any job other than archer. Lv40 Leves introduce the "defend the area" objectives, which are usually pretty easy because the mobs die fast and the spawn time between "waves" (1-2 monsters =/= a wave but whatever). Difficulty of the leve is not the issue here though, it is the location of the leve thats an issue.
For me doing 1 star would be just as hard as doing 5 star because of the simple reason that the monsters AROUND the defend objective are aggressive and meaty. The radius you can stand in for these leves is usually of a decent size to stand in and so its generally possible for me to find a bush or tiny corner to stand in where the Efts can't use their satelite imaging service to find me from 30ft away.
Problem solved, right? Just stand away from Efts noob, yes? No. The monsters you have to fight are ranged/magic. That means unless I am an archer I cannot fight them from the ONLY spot in the bloody area that is free of aggro and forces me to move into them otherwise die a horrible death. At this point one or both or the entire forest moves and aggros me, at which point is nearly impossible for me to survive. As a gladiator, it is nearly impossible to survive. I have Sentinel, Rampart II, Guard, all those lovely abilities and I can't survive. What does that mean? That must mean every other class dies a horrible violent death over and over again on these leves.
Root of the problem: The curiousity system made it so monsters high up on the difficulty chain: (Drakes, Piestes, Efts, etc) would "notice" you from afar but would hold their ground and watch you unless you provoked them. Now that the curiousity system was entirely removed (different thread entirely, so I won't rage about how annoyed I am at that) the "detect" range monsters used to had became full aggro ranges. Which now makes those particularly difficult monsters (who still lay sprawled about in crossroads and bottlenecks) very difficult to avoid. And sure, as a 47 Gladiator I can kill a r44-46 Eft, but it becomes stupid with several r50 gnat levemobs on me. I'm at the point now where I almost don't even get these leves from the counter, the gil they reward you with is hardly enough to cover the 40-50k of repairs I have to pay just to finish the bloody mission.
/Rant.
EDIT: Let me just say again that the purpose of this is to address the issue SOLO players have with this. I don't really care if you can do the leve fine with your Linkshell because so can I. This is about the woes of trying to defend the area solo. I'm also not suggesting all leves be void of aggroing monsters (although I wouldn't complain, either) because that adds a little spice and strategy to your objective. But this one is just so frustrating I could no longer resist the urge to rant.