I love WHDload. It's probably the best and most useful utility I've used on the Amiga ever. Without it, I probably wouldn't still be into the Amiga, and thanks to Bert Jahn and his companions I still use my Amiga.
When it comes to incompatibility, it's usually because of wrong tooltypes settings. I had more than a few games work by tweaking the tooltypes according to my system. Try out different tooltypes before you give up a game completely.