Almost by co-incidence I have been playing through Blood during the past week or so.
There is a reason, not just because of DOS Game Club but because of the latest release of NBlood. This is an EDuke32-based port of the original game, and for people who may have issues with DOSBox or obtaining suitable hardware I have found it to be an excellent option.
I was one of those who originally played Blood back in the day as a brand new game that someone *ahem* managed to obtain. BloodBath was extremely popular at our LAN parties, and while not necessarily my favourite of the BUILD games, I definitely find a lot to appreciate about Blood, even in this latest playthrough.
I might post some more thoughts after a bit more playtime.
I have no idea how fast it is running for you in DOSBox, but IMO compared to other BUILD games it feels faster and harder.
On that topic: enemies feel smarter and more aggressive, which I think is mostly achieved by having them chase you down promptly. Their weapons also bite; cultists carry the same kinds of weapon you do (i.e. shotgun, tommy gun, dynamite), and some monsters combine ranged and melee attacks.