Based on my experience, some things written on Trip Advisor about Vieques seem to be true. And there are some things I did not find to be true at all.
Personal safety: don't go places alone? Not true. I am a single woman and never felt any danger on the island. I will say that petty theft is rampant and you simply cannot tempt the locals in any way.
Pretty: The beaches are incredibly beautiful. No argument there. I was very sad to see how the residents abuse their environment. There is little or no recycling - maybe it is too expensive? The amount of trash along the roads, in the streets and around houses is bad. So sad that locals don't value what they have and take care of it better. In contrast, Culebra was pristine. I never saw litter or garbage anywhere except in the trash receptacles. So strange that neighboring islands would be so different.
Dangerous to drive: Not true. The roads were in really good shape on most of the island. They are not super wide. You have to share and be willing to stop on the shoulder and let people go past you at times. No big deal. Parking in Isabel is a nightmare. But dangerous? I think not.
Friendly: I can't say I got a friendly vibe. I did my best to smile, be pleasant and say "buenas dias" when passing anyone. On most islands, I get an in-kind response but almost everyone on Vieques either ignored me or frowned. The folks who work at the various stores and restaurants were helpful and friendly.
General items: I talked to some locals and they report that Vieques is known for having a lot people who do nothing but live on food stamps and welfare checks. They have a big teen pregnancy and illiteracy problem here. This is not ture of all islands. I have been to islands which have a literacy and high school graduation rate of 90%. I found the difference between Vieques and Culebra to be huge and I will visit Culebra again but probably not Vieques.