You might think that Outlaw Run is two feet shorter than this one, but that's not really the case. Outlaw Run has a 162 foot drop and that's at least 55 taller than the this one's.
Goliath is 165 feet tall with a 180 foot drop and Wildfire is nearly 184 feet tall with an almost 161 foot drop. Both are wooden coasters built within the last few years and well above Mystic Timber's 109 foot tall structure.
Yes, but all of those are hybrid woodies with inversions. The influx of RMCs has been a wonderful thing to entusiasts and industry alike, but traditional, large woodies seem to have died off completely in recent years. If you disregard Lightning Rod as well (which is built on a hillside, and while it has a lot larger height difference than Mystic Timbers, it lacks a tall, freestanding lift hill), this is actually the tallest, traditional woodie to be built in the US since El Toro.
It's not a defense of this coaster, though, I agree with the rest of you that it seems rather mediocre, especially with Beast a stone throw away. But I think it's an interesting observation. It seems like parks have collectively agreed to all go the extra mile when they build large woodies nowadays, and slap inversions onto them as if size isn't enough anymore. Arguably, with the technology available, it has become a "waste" not to have inversions when you're spending millions of dollars on a woodie anyway. Build anything taller than, say, 40 metres, and inversions are practically a requirement. Mystic Timbers isn't an unusually large woodie per se, it just appears to be a rather large coaster for the "not quite big enough for inversions" size bracket. Strange how technology marches on...