+4 enhancement Str, +4 HP/level (only counting Corpsecrafter and normal Desecrate, since the rest feels much less common and class dependant, or just DrMag material), +4 init, +10 ft speed, +4 Turn Resistance, +1d6 Cold damage on natural attacks, +2 natural armor.
That seems like a high +1 to very weak +2. This does not account for -0 undead, and should be dependant on the undead (way better on a beatstick undead than on a tomb mote or an incorporeal one), but that should give you a guideline if you want to allow players with undead characters in your campaign. As Debatra said, I think a lot of us would not like to redo LM with or without any of these enhancements.