You think that Diablo 2 has more tactical combat?? Since when does Diablo 2 has tactics?
You cannot mean you missed the most important tactic missing in BD, can you?
In diablo and many other games a ranged specialist do can the Shoot and Run tactic.
In this game it's not even possible to protect your wizard with your death knight, once an opponent has targetted your wizard.
And it's not the AI that is being smart here: enemies just target the closest PC.
If it's the wizard then you have a problem. You cannot outrun your opponent nor do your enemies receive an attack of opporunity, if they run past your knight towards your wizard (like they would in NWN or TOEE).
That is annoying.
Other tactics: in diablo you have to target shamans before devils for example, because the shamans keep raising the fallen. On the other hand you need to attack devils to reach the shaman if you play a melee type.
There's only one fight in the demo with more than 2 creatures (normal difficulty) and that's the fight near the kitchens. And they didn't even include a spellcaster to complicate matters. Here it's just a matter of talking them all out one at a time. Not very exciting.
What also bothered me was that elemental damage types didn't seem make any difference in combat. Even in diablo you have to pick the right weapon to get past damage resistancies.
In this game it's really no more than click at opponent once with knight selected and then select main character and repeat. Maybe drink one potion during combat and you win. Not very exciting.
Compare to diablo where you have to dodge fireballs while shooting and running. Or compare to NWN where you need to buff your PC with spells and potions and worry about DCs, reflex saves, ABs, spell resistancies, disjunctions, etc.
Tactics man!
I'm pretty sure the devs could have thought up some difficult encounters and hand out some required scrolls and buffs necessary to win the fight, but they didn't do so in this demo.
