I haven't tried the Hunter yet, but I kinda like the Titan over the Warlock right now. As you said though, it could change in the final version or even the beta when more skills are unlocked. The Titan's super is nice because when you get swarmed, you can pretty much kill everything around you.
It happens to me occasionally as well. But after exploring for a bit its repopulated. Also as a side note: there is a bouncy ball near the bounty guy that you can kick around. Its near the crates next to him. Its fun trying to get other people to mess around with it with you.