I guess I just have a thing for triggered abilities over EtB effects...
I mean I love some EtB creatures...but I dislike a critical mass of them. Feels better to earn something by doing a little more than just casting it successfully...
I agree with you in principle. I like triggered abilities and I don't think all 4 drops should impact the board immediately via ETB. But Ogre really is only worth his cost if you combo him, and even then it might not be amazing because it happens so late in the game. Giving a bunch of dudes haste and +2/0 is useless if your opponent has a bunch of guys in the way. And that's where I found him to be inconsistent. Basically, if the path to my opponent is clear, Ogre is overkill. I'm winning anyway. If I'm losing or the game is close, this guy just doesn't do enough most of the time.
Hero of Oxid Ridge is a similar card, but it's much better because the effect happens sooner and it gives some form of evasion to make the effect consistent(ish). Ogre has a higher ceiling obviously, but more often than not it has way less impact I found (again in limited testing).