Not kidding. Some valid complaints there, but let's not confuse bugs with design.
1) Agreed, needs scaling.
2) Never had 15 mins. Usually appears within 2 minutes, frequently within seconds. Of course, different people might have different experiences. It may be to do with how people fly around the target which determines how well they trigger for someone. I keep my speed a bit above minimum and keep my heading slightly away from the planet since if you are pointing at the planet it won't spawn the USS too close to the planet, thereby not triggering.
3) Nope, i only get that if i arrive early. Pretty sure its only triggered if you do arrive early. To avoid it, i simply don't go to the system until the start time has passed.
3a) Nope, always there for me when i've done that.
3b) Not had that problem either. Not saying it doesn't happen, just not in my experience. However, its rare i've done this, see point 3.
3c) Yup, so simply don't go to the system too early and never have this issue.
4) Again, not something i've experienced... and i've done a fair few assassination missions. I don't recall a single assassination mission where i was attacked by a mission related NPC on my way to a target. So, i guess ill have to take your word for this one. Personally i'd enjoy the chain of attackers. You say more difficult? Cool! Bring it on. Plus more bounties! A win-win! Doesn't sound like a bug either. Nothing wrong with doing assassinations in a courier, its a good little fighter ship. I personally wouldn't, but hey, depends on what sort of challenge you want. Don't complain though when you take a stick to a sword fight.
5) Interesting, never seen this one either. Maybe this is one of those things that only seems to happen in Open? You are doing these in Open?
6) Well, you might have a point, but again, not a bug and for me its useful. I often do assassination missions when working the BGS. When working the BGS its always good to get cargo rewards. You can then immediately sell them at your home station and it gives a little addition to your faction's influence.
So, most of your points are not actual bugs. Maybe bad design decisions, but that's not the point of this thread (as far as i understood). The bugs you do list, i haven't expereinced.