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|New Rating system (RIP Greven)|
Power | Flexibility | Synergy
3.0 - Total Bomb | 3.0 - Effectively Colorless | 3.0 - Best with others
2.0 - Play this card if you can | 2.0 - Splashable, 3 color | 2.0 - Better with some decks
1.0 - Filler | 1.0 - Playable in 2 color without problem | 1.0 - No special interactions
0.0 - Unplayable | 0.0- Needs 10+ colored sources | 0.0 - Sideboard

I think starting a curve on 3 in this format is a recipe for disaster, so this guy is usually playable, although not ideal.
0.5/1.0/1.5. That's a strong 0.5 on power and a weak 0.5 on synergy because filling your graveyard is a pretty fringe strategy.

I wonder if this is underrating him? 2s are so important, and the 1 toughness doesn't matter that much does it?

Yes, I'd give it 1 on power. If you're UB, Shambling Ghoul is your best bet, but this is probably better than Maritime Guard.

Yeah, 80% of the time he's as good as Subterranean Scout, and 5% of the time he's better because of the self mill.