I've been using Shandera on my Standard OU team, and it's still really good, even without Shadow Tag. I still use the Scarf version, because it's still a really good spinblocker, and his Overheats are still coming off of 145 base Special Attack, only 5 less than Dialga's. In fact, even without Shadow Tag, you can still hit the switch-in really hard, which can put just as much pressure on the opponent.
Fire/Fighting/Normal immunity in addition to Grass/Ice/Poison/Steel/Bug(4x) resistances is still really good. That's 3 immunities and 5 resistances if he has Flash Fire. That's a set of resistances that I'd expect from a Steel-type.
3 immunities is great for a Choice user, and his unique set of resistances can still help him be the glue for a team, regardless of the SR weak. While he's similar to Heatran, he's also quite different.
- Shandera has a Normal/Fighting immunity, with no 4x weak to Ground
- He has a useful secondary STAB, and anything resistant to Fire/Ghost is weak to HP Fighting
- He's faster
- Hits harder
- Has Calm Mind for non-scarf sets
- Blocks Rapid Spin while taking out a large amount of the Rapid Spinners
Those are some reasons to use Shandera over Heatran, and there are many more reasons to use Shandera over Gengar, with one of them being that Shandera's much bulkier than Gengar, plus the useful secondary STAB.
I personally used Shandera on my team because I needed someone to patch up the Fire/Fighting weakness and also needed a spinblocker with just one slot left on my team. Hence, I needed something that could do both, and Shandera was the only one who could fit the bill, so I picked him. The fact that he made it through the team cuts on my team meant that he didn't totally suck balls at his job either.
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some hero, maybe if there's this many people disagreeing with you, maybe...just maybe, you're actually being too close-minded?