I'm sure the problem is that many things advertised to be "ecstasy" now are not in fact pure MDMA, but instead contain other substances. Nonetheless, the other substances advertised as ecstasy are rarely dangerous. There's one exception: a substance called PMA caused several poisonings, a few of them fatal, in the early 2000s. But in many people's estimation, taking ecstasy is still a decent bet.
If there's anybody reading this who doesn't get why someone would take MDMA, it causes feelings of profound connection with everyone around you in addition to a stimulant effect and a heightening of tactile sensation. This makes it especially good for raves and the like. I've personally never really been a fan the few times I've had it, but some people swear by the stuff.
Oh by the way, I'd recommend
erowid.org to anyone who's legitimately interested in why people might take drugs and what they do. Its slant is obviously pro-drug legalization, but it's got far and away the best information about drugs on the internet, including extensive experience reports about substances by people who have used any drug you can imagine.