I've been able to solo everything (No companions) in tactical mode as a hybrid so far with careful planning and prep my build is as hybrid as it gets (1 point in everything, high memory with as many skills as possible). Hybrids are better/stronger than DS1 as you don't have to level up each spell school for slots, its all memory. This allows you to be able to swap in/out what you need without having to dedicate points to a single skill school.
In short - Hybrids work, memory is what makes it work. The synergy/number of skills hybrids can do makes up for their slightly lower damage, its a fair trade off.
