Are you wanting to see number of assigned tasks/planned hours for a user or for a project?
If it's a user I would do an assignment report then you can group it by who it's assigned to. If you have the hours sum from the column page the hours will sum on the summary page. You could then do charts from there if you wanted.
example: this shows number of assignments for a user by project with a sum of planned and actual hours from the summary panel.