tactician mode should be renamed min/max mode then you will have fun in early levels, once you get enough skills just lol at the enemy in later acts. NO NEED for any tactics other than min/max each character. NO need to spread skills around at all just go pure nuf said. NO need for a magic and physical split just go pure you will break armor then break them. the only skills you want to mix in is invis/ports/adrenaline.
EDIT: nah honestly there is still some tactics involved. just dont try and build fun/split up builds in a games hard mode i guess thats just asking for a downfall. really like elletard says you should learn the basics in easy mode. Then in tactics mode you know what tactics to use and where to use them.