Sequels are great, they allow devs to fix up what's wrong and boost what's right. That's the theory. Unfortunately Triumph didn't get that email, and have instead broken what was fixed.
The danger in all action adventure games is that play devolves into nothing but holding a thumbstick and watching the player character trog around 3D areas which took god-knows how much time to put together, whilst being bored out of their wits. It killed Tomb Raider and is exploding the 'sandbox gaming' myth before our eyes (see GTA4). The original game avoided this with tight areas where new enemies and situations kept things fresh. Here? No.
After rescuing the umpteenth minion from a spiderweb only to see the same scripted descent of attacking spiders it becomes abundantly obvious that this didn't occur to the devs. The sprawling areas dotted with not a lot and nowt really make it worse.
The big 'thing' with the game is being THE Overlord, no niceties, hapless peasants are enslaved or butchered. Cute, but if that was the intention then why have they thrown in these pointless minon-possession macguffins? These sections (where you control a minon, for no real reason) are artificially limited by force-fields and irritating as sin.
The other misc. problems include the constant loading, the fact that the Overlord's tower is now more spread-out than ever (more loading, more holding that thumbstick up), an apparently drunk floating camera, and most new additions achieving nothing. Minion mounts are .. well they're meaningless in the grand scheme, the new Roman army 'menace' is just a bunch of guys standing around with shields (big whoop) who need to be defeated using the same sloppy minion controls. Deciding whether to enslave or slaughter the populace involves chasing them down and whacking them (snore) or zapping them with the enslave ability which takes several seconds (zzzzzzzzz).
There's several things that could have been done to change the game, not least having mistresses accompany you. But no, they just hang around the tower, apparently cleavage provides reason enough, and titilation for our TOTALLY EVIL anti-hero. Er, no, try again. The minion control's sloppyness prevents combat being anything more than sweeping over enemies or dumping greens and waiting for them to backstab, that part of the game really needed work in order to stop it being 'small enemies = sweep browns, big enemies = backstab with greens'. There's no variety. The Overlord also continues to be outwitted by small embankments which he could physically step up on, invisible walls and other drivel, so much for being the man, he can't even lift his feet up.
The Overlord's equipment now has a lot of different effects (such as doubling the value of souls absorbed) which is a nice touch. I wish there was something else to big up, but after several hours play that's genuinely it.
With the sprawling, boring play area, completely uninspiring additions and retention of the downsides from the original this feels like a huge step backwards. The most damning evidence for me personally is that I've not managed to get the disc back in the console after the last time I stopped, revisiting crusty old Oblivion is a far more interesting proposition than playing through Overlord II.
Wait until it's £20 or less, there's no way this is worth top-dollar and the devs shouldn't be rewarded for handling this sequel so cack-handedly.