As I've said in a few different threads around, I much preferred Speaker for the Dead, Xenocide and Children of the Mind to Ender's Game. I did enjoy EG too, but to me they hardly seem part of the same series. I see EG as a sort of launching point for OSC to explore different themes through the various series that spin off it. Speaker and the others are obviously much more philosophy- than action-based, which I found unexpectedly enjoyable (I haven't read many books like that before).
In my mind, Speaker, Xenocide and Children sort of blur together - I'd say if you didn't like Speaker as much as EG, you'll probably feel the same way about the other two. But I'd still highly recommend them. I haven't read the Ender's Shadow series (about Bean from EG), but I get the sense that they're more like EG than the others. Maybe you should give those a go too.