So this site has been one of the most popular before, even though by time, YouPorn, XVideos, XNXX and Pornhub got more audience. Honestly, I don't see a good reason why RedTube isn't ranking higher, the site really does the job, you know, everytime I enter it.
• smooth design, black background, elegant and classy, not very different from PornHub
• clean interface, even on mobile version, no annoying ads and popups
• playable thumbnails that show sequences of the video before clicking on it
• diversity in categories, tags and fantasies, from step brothers to lesbians and bdsm
• fresh content uploaded
• The only disadvantage I could notice was the fact that they ad their paid membership, but so does PornHub even more aggressively so I don't see why this would be such a problem. The videos they allow you to see for free are also hot, pro and HD, not only bait for the membership.