The Oculus was a bit tricky back in the day and required several macro's to get it going but once you knew the strategy and had it laid out properly it was extremely easy/smooth. It still took the longest to run usually out of all the heroics during its prime.

Scarlet Halls, first boss. Have the main hold the hay/shield and walk forward with the rest on follow, typically need some type of heal about half way on heroic.

The monastery first boss should be a tank and spank, not sure on that one. Unless I am confusing the two, the one which the guy that does the whirlwind is a bit tricky though.

Most heroics are doable, albeit painful. It is the raiding scene that truly tests your limits.