Some older reviews state that the scenarios in the Crusader Trail were too hard. I think the devs have adressed that because nowadays there are two difficulty levels; normal and easy. I do easy first and then try my luck on normal. I am in the last set of scenarios and indeed two or three of the scenarios were too hard for me at normal so I only finished them on easy. Not such a problem imho. Also some say that the campaign is kinda short @ 11 missions and you have to buy dlc’s; not true because you have to include all the content in the Crusader Trail which adds 24 missions. I clocked more than 100 hours already without any dlcs. Note; always choose “special edition” on GOG because it includes Stronghold Crusader 1 in HD (!!) and the price is the same as the standard edition.
