SP3 could be fun and as upside, its scale allowed for some "grand" maneuvers (I just edited my OOBs for it by significantly reducing the movement as to not have tank crossing completely AT gun effective range in one turn) and it was fun. A bit. However there were just too many issues to provide for a lasting joy (for example the "immobilised = killed" thing) and SPWW2 was more fun, so I moved along... And I suspect removing these issues once again would not do too well in effort-benefits analysis
If you want something based on SP3, get yourself SPWAW and check it out, has some nice features too, but generally I prefer SP2 based games.