Basically what the question says. I vote for SOD2: Return to Danger, and feel it is the worst by a fairly large margin. Even its mediocre (or at best lukewarm) "sequel" seemed to have a decent leap in terms of mapping quality.
The real sequel to Spear of Destiny is Spear Resurrection, I don't doubt that at all. It was just 8 or 9 years to late! And then SOD3 should have either been Spear Ress. 10-year or End of Destiny. (SR10YR is like Ultimate Challenge is to Return to Danger in that it uses all the same resources, but improves level design (albeit this time already from a very high standard rather than a very low one) while EoD is the real and legitimate sequel.) I think any combo of these are what the mission packs for Spear should have been, they would have probably fairly easily become even better than the originals, IMO! Of course I'm not complaining about awesome freeware though, all the better for that.
The real sequel to Spear of Destiny is Spear Resurrection, I don't doubt that at all. It was just 8 or 9 years to late! And then SOD3 should have either been Spear Ress. 10-year or End of Destiny. (SR10YR is like Ultimate Challenge is to Return to Danger in that it uses all the same resources, but improves level design (albeit this time already from a very high standard rather than a very low one) while EoD is the real and legitimate sequel.) I think any combo of these are what the mission packs for Spear should have been, they would have probably fairly easily become even better than the originals, IMO! Of course I'm not complaining about awesome freeware though, all the better for that.