I played Ophelia the other day. This was a very frustrating experience. I like to play Meepo/Chen in DotA occasionally, and expected somewhat the same controls. A few things that differ:

Say that you group your hero + three creeps in group 1. Now if you press 1 twice you focus on the first unit right? That's all well and good, but if your dead hero is in the group, it still centers the screen on the place you died instead of on one of the creeps. This is different from DotA, and thus bad because you have to re-learn if you played DotA. I also don't see any point on centering on the dead hero when you have other units in the group. I have encountered same thing for Hellbringer.

Lets say again that you group your hero + three creeps in group 1. Now if you press Tab to change the subselection (subselect here = the unit whose skills you may use) to the 2nd creature, and then press 1 to select the group again, the behavior differences from DotA. I'm going to explain: in DotA when you select a group by pressing its hotkey it will always subselect the first living creature in the group (the hero). In HoN you keep the subselection you already have! If you have Hellbringer + pet on group 1 and you have the pet selected when you press 1, you will still have the pet subselected after. This is really hard getting used to. I don't claim it's better in Warcraft III, but it works for me there and I don't see any point of changing it.