Yes, wrath dungeons were "somewhat difficult", but that was it...There were a few instances/bosses that were hardish, but that was it. Loken, H UP, H HoS and H Occ was about it, and only certain encounters from those heroics. The rest were faceroll easy, maybe not faceroll easy for the achievements, but faceroll easy for the loot. In addition, many people didnt even bother running heroics, since Naxx 10 and even 25 could be done in quest gear.

As a BC raider, I know what it was like then. You couldn't do kara in quest gear. You had to farm heroics, do the key chain. Then you could do the first 4 bosses usually. Farm those for a bit, progress passed Curator, and THEN you could do 25mans. And back then, Heroics were HARD. H SH, H SH, H SV, H Arc, H Bot, H Mech, all hard, and not just once boss... Then MgT came out, and that was HARD too. I was in t5 at the time, and you could not pug MgT or its heroic version (mostly cause CC was hard to get in a pug,since only mage/rogue/hunter was real CC back then)

So yea, Wrath heroics were bad. And on the comments of they provide loot for new toons. They need a system where they can detect somehow if you have raided on that account or not. I hate seeing new charactors at 80 in t9 (t10 now that JP are out) who think they are ready to raid and have no clue about raid mechanics. Luckily, Cata instances teach raid mechanics a lot better. Bunch of people gonna get their asses handed to them.