Whenever people refer to a website that can only be described as the cancer of the internet, they usually have 4chan in mind. They aren't wrong of course, but keep in mind that there are many forms of cancer that manifest in different parts of the body. 4chan is only one of these many cancerous sites, with another being Tumblr.
Oh Tumblr, where do we even begin with you? If there's a huge glaring flaw with the website, it would certainly be the demographic. Social justice warriors and their ilk are basically the roaches to Tumblr's sewer, as it is festering with them. All over the website you have these close-minded, ignorant, bigoted, all-around loathsome pieces of shit who go out of their way to police other people's words and thoughts, labeling what they don't like as "problematic". If you piss these people off, you could very well be on the receiving end of a doxxing attack with your public information leaked to people who could do god knows what with that information, all because you have the gall to not blindly follow feminist dogma, or don't believe that you are more privileged for being a white male. And the sad thing is, people may want to say that they're only a minority, but this mindset is all too popular among edgy hormonal teenagers, self-loathing whites/males/white males, and bullies who never quite grew out of school who want to exercise authority over others. Maybe I'm taking this bit too personally, but as a straight white male who came from a dysfunctional home complete with a narcissistic dad who would blow money on beer and cigarettes, a physically and mentally abusive stepmother who was an absolute tyrant of a woman, bills often being paid behind schedule resulting in loss of power or water, a lack of funds meaning that I lacked a personal computer until I was in my senior year in high school, and could barely afford to go the doctor's or take driving lessons, nothing pisses me off more than having people tell me that I'm supposedly privileged and that I need to check it. Fuck off with that noise. Even without those people though, the page image ought to let you know how many unfunny hipsterish people there are on the website.
But personal anecdotes aside, the website itself has a flat out awful layout. The way the website is set up does not allow for steady discussion as you just reblog posts which makes it completely and utterly fail as a platform to discuss things on unless if you like awkward and stilted reply stacks. There's also the fact that some blogs are set up in such a way that instead of going from page to page to look at someone's posts, you basically load more and more posts on the same page eventually turning it into a slow, bloated, gargantuan mountain of posts that causes your computer to suffer from severe slowdown. Those blogs... dear god, how do you even design a website like this?!
There are some positives though. There are plenty of cool anti-SJW blogs to follow, and every now and then, you'll find a really cool artist or person who flat-out doesn't give two shits about that kind of stuff and would rather entertain you with other things. I'm particularly a sucker for blogs that showcase beautiful photographs of various structures or animals. And if you're more of a lusty kind of person, there are tons of porn blogs that cater to just about every fetish imaginable. I'm not going more into that, but you'll have a good time if you're hunting for lewd content. :p
All in all, that website has tons of stuff that pisses me off on a technical standpoint as well as an ideological one. However, there's just enough redeeming features of the website to at least justify going on there, though you sure as hell won't have me making recommendations.