The main problem I find with the AF is that it struggles with areas of low contrast (like many other AF systems).
My simple solution that works quite often is to rotate the camera through 90 degrees or however many it needs to lock on, lock the focus and recompose. I've used that method many times over the 10+ years I've used mine
As for not nice to hold, that's a personal opinion and may be down to hand size, I find it very comfortable to hold and use.