1 - being able to choose skills when you gain a level. It doesn’t make any sense whatsoever. You can’t spend a day swinging maces at goblins and become professional at climbing. ADOM suffers heavily from this.
2 - complete lack of a story. I want to know who I am and what I’m doing. The more story the better, as long as the gameplay doesn’t suffer too much from it. This is the best feature of ADOM.
1 - orthogonal only shooting. Doesn’t make sense.
2 - no ASCII display.1 - lack of a concise list of commands. ADOM and Angband suffer from this (or maybe I couldn’t find the list.) Frozen Depths has a nice list that can be accessed with a command.
3 - numpad commands and inability to change. It’s hard to use numpad on my laptop
2 - non-persistent dungeons.2 - changing terminal size changes size of levels when they are generated. WTF ADOM!
1 - futuristic theme. I prefer mediaeval fantasy.
3 - combat only. There must be ways other than combat to obtain items, like the deep smiths in Frozen Depths.