Are you scared of dropping?
Do you have no idea what is going to happen once inside, apart from a drop?
Are you scared of the dark or monsters?
If you answer yes to any of the above I would think you are going to enjoy this more. It's good to be scared and then overcome this ride. If you have read everything that is going to happen, there will be no surprise. Just like a film you've watched before, you might enjoy watching the film but it's always good that first experience.
If you've experience Thirteen or The London Dungeon: Extremis before you will know what to expect from the drop but have the added fear of not knowing when it will drop. It's all in the build up to the drop and it doesn't end there as you have to escape. With all the effects the whole thing is a thrill. You might walk out and say "Was that it?" Because you wanted the drop to be longer or you might be expecting to be frightened more. Maybe you will be kidding yourself or try to look like your not affected by what had happened.
As a full multi sensory experience this is a good thrill even if your not scared you can say you have done it. A good addition to Alton Towers. Good for people to get the story behind Nemesis. You might not want to ride this again depends how your feel about the experience because every one will have different fears or no fear.
A good thrill for any one brave enough.