What's interesting is that groups will now wipe on the original heroics like Grim Batol and Stonecore, even decked out in RF gear - because they're getting lazy with their interrupts and CC.

You have a good point there. There's nothing wrong with having challenging instances, just don't make them so damn long like ZA and ZG. Though I do like that they weren't so linear... that part was refreshing.

Regardless, they shouldn't have been so hard. That's the charm of the final 3 Icecrown 5-mans.. they were short, but still challenging. Especially HoR! Then look at Utgarde Pinnacle and Halls of Lightning, which were worked out fine... they were long enough, challenging as well, but if you knew what you were doing, they weren't so bad. Well, maybe HoL was until you got better gear.

What Blizzard should've done, in my opinion, is given us ZA and ZG that weren't quite SO challenging (maybe make the final bosses challenging, but not the sub-bosses) and then made tougher dungeons in the HoT 5-mans.

It's kinda funny. My friend was SO nervous about the Hour of Twilight dungeons after the troll dungeons. I kept telling her they were easy, and she didn't believe me, and finally we did End Time, we went through the Obsidian Dragonshrine, she accidentally aggroed all the trash when we were going after Baine (not that I blame her for it being her first time), and she was convinced that she wasn't good enough for these dungeons. I told her it's REALLY easy and proved it by doing End Time myself in less than 20 minutes. She tried it again and did all three that day and she was like, they ARE easy!