Guild Wars 2

Almost all of them depend on large groups of players, if not the whole map and my own constribution to them feels like 1%.
To top it all off due to the large amount of people who simply do not care or are bad players the achievements fail more often than not and I have to waste hour after hour for the events to restart just for another a try where I will have little influence on the outcome again.

Just now I saw someone trolling the spiderqueen while engaging it solo. He got cocooned at eaten before the people who were gathering could reach him.

I have to wonder why Anet still makes achievements and content which can be trolled by single person and ruin the time for the rest? One should assume they would have learned over time.