It's worth a visit! The energy is way different from Brazil or Portugal. Only bad thing is corruption, but that can be largely overlooked if you're just coming for a visit. The amount of parties and sight seeing you can do will be far more than enough to satisfy you. There's a shyt load of partying/clubs/raves around these parts, and alcohol is relatively cheap. The beer is amazing.
The women are cool, especially if you're a foreigner. A lot of baddies depending on where you go. Due to the economic situation the bad & bougies are more than available, especially if you're fit, got some dough to spare, and love the partying just as much.
Drugs roll, but it's not terribly out of control. Most women still just stick to alcohol, many smoke weed.
I wouldn't travel to Portugal again if it meant saving my life, for obvious reasons. Brazil was alright, but I was too young to really enjoy it, though the prospects of guns is not an appealing one.
There's guns in Angola, but the warfare in Brazil is way way more nefarious.
Note: there's many expensive places in Luanda, but like anywhere else, it's all about finding the alternative which can often be better than the expensive place you found.