it could be argued that at least troops could be blocked from climbing stairs and that the melee combat was better. So, subjectively, it can be said. Warband sieging lacked pathing and siege engines, engine couldn't deal with destructibles nor interactive objects, not even moveables until Viking Conquest came out. All in all, a simple port of warband to a new engine (literal copy&paste) and than working on adding pathing, behavior and interactibles (including doors like we see in BL) than it would be objectively better, simply because everything else in WB works better than in BL.
There's logic to that argument, it's just not that easy a pov to grasp.
And if we're to keep into practical objectivety, Warband had better gameplay minus sieges, with better loops and coherent features. BL's addictive, but the core loops are flawed and boring, balancing's questionable, combat's worse, commanding troops' 10 times more clunky and downgraded, AI behavior seems erractic in comparison, perk systems' clunky and poorly thought, smithing doesn't make any sense, villages were downgraded, castles' remain just as useless, campaign AI hasn't improved not even an inch, and to top it all, collision was removed for cavalry against walking characters, which to me is among the greates offenders along with AI being able to push the PC, which's exceptionally annoying.
Ultimately, there's too much AI automation and a blatant partial removal of player control over troops in battles and complete removal in sieges. If we interact with the troops they'll get into erractic behavior. We can't order battlement placements, strategical defense retreats (although defensive sieges are almost impossible to happen), keep defense's just as generic as it was in WB, so on so forth. We lost the ability to command troops to take 10 steps back or forward, when what we needed was a much more deep command system, instead they've removed it and we still can't control formation targets nor tactical maneuvers like skirmishing. We also needed a completely separate one for sieges to order specific entry points and engines operation, as well as for defensive being able to order tactical placements, displacements, and retreats. As is, if you got the troops, you're basically watching an interactive cinematic when in sieges.
It's much like it used to be in Warband basically, it's just more of the same with catapults and breakable doors in much bigger scenes, the best tactical move in defensive if you got elite troops' to open the gates and order a charge, identical to Warband. I'm dead serious.