Hookups are fun, but IMO never as good as with someone you know and really trust. The best "intense" sex I've ever had was with a guy I randomly hooked up with, our physical chemistry was insane and everything just completely clicked between us. The problem, for me at least, is that no matter how amazing hookup sex is, it's never really fulfilling or satisfying for long, it just leads to more empty hookups.
It's not a bad thing necessarily, but its very different from the type of sex you have with someone you love and actually trust. There is a real thrill on seeing a guy's cock or hole for the first time, and exploring someone's body that you've never met before, but after you've been through enough hookups it starts to all feel the same.
As far as taste and smell, the best case scenario is you taste and smell nothing bad. But when you live the sluttly hookup lifestyle, beggars can't be chosers and sometimes you get a guy that's a little off.