You say it's horrible cause you have not configure it properly.
first get from the first page the behavior for your char, let's say fury warr for example, and save it in your lazybot folder, behaviors folder. Next go to the bot, open combat setings, and where is the drop down that says select behavior, select fury warr and press close and don't save (don't press save behavior)

Next, when you start the bot, press log debug, and it should show you what spells you have on bars and wich are not (do not use any addons)
If you have a druid, shadow priest, don't use bar 1, use bar 2-6....any key from 1 to 0....not 11 or 12.
If you are low level, depends how the behavior is set, it could be that only the high lvl spells are set into the combat sequence.
If you have more questions, post again, and don't disregard the bot before you see what it can do.