In my opinion the Troglodon is a very good model to include in an AoS army: ignoring the fact that is insanely beautiful (it's my second favourite Seraphon miniature, just after the Bastiladon), I think it has also some good rules and stats.
Bravery 10 is very good, despite you won't use it often cause being a single model unit your monster doesn't have to take Battleshock Tests.
12 wounds are a pain in the ass for your opponent, also thanks to the 4+ Save our blind dinosaur has.
Oh, and you have a mage in proximity of the Troglodon?
Well, so you can use your Slann/Kroak to boost it to 3+ (Mystic Shield) and channel all the Slann's remaining spells through the Skink ("Defensive" option).
I think the Starpriest also is a good solution to support your dino: using his ability you now have a big monster able to do 6 bite attacks in combat each dealing 4 damages (Offensive option) and you could Summon Starlight on the Troglo to make him more difficult to be hit.
This monster can also damage your opponent soon, having a 18" ranged missile weapon and a good Move stat. Assuming your Troglo has only 5 wounds left, it still moves faster than our cavalry, spits the same range as salamanders/razordons and can charge potentially up to a 14" distant unit (17"'if the unit has been wounded by your missile weapon) and still deal some serious damage.
You can summon it with a 10 on two dice. Not easy, but non impossible: if you are fighting under the Sage Staff constellation and maybe whit the help of a BSB/Starseer it decreases to 8, just one more than the average two dice roll
In conclusion: I love playing a troglodon in my army, cause it's useful in any phase thanks to its stats and rules.
It is also nice to see and intimidating, which means your enemy will probably pay a lot of attention on it, occasionally too much, leaving you the possibility to maneuver the rest of the army more freely.
Best use of Troglodon (in my modest opinion): begin your turn near a Starpriest, cause you want his buffs.
Spit on a large infantry unit with low Bravery and possibly low Save characteristic.
You charge it the same turn (helped by the "buffing Move" ability from your missile) and make use of the Starpriest's spell (both Mystic Shield and Summon Starlight are a good move) and, in particular, his ability.
You should attack first, before letting your enemy hit you.
Deal a good amount of damages, and without forgetting the Troglodon's roar aim for a nasty battleshock test!
Low risk targets:
- weak and large skaven/goblin/human units
- bad Save characteristic units (as long as you attack them first)
Medium risk targets:
- big undead units. You can kill tons of them, but their respawn ability tends to keep you in combat for long, and it's not the best choice for your Troglodon
- small élite units with not too much Save. You can cause them devastating Battleshock tests, but they hit hard, so you have to be the first to attack and remember your dinosaur has NO Rend!
- flying units. Again, obviously it depends on who are you facing, but with them it may come to good use your high Movement and ranged missile weapon.
High risk targets:
- heavy armoured units. You can't pass their Save, so better not to get involved in a combat whit them.
- single models, such as heroes or monsters. Yeah, you can do a lot of damage if their Save is low, but which hero or beast has low Save? Furthermore, you can't cause them Battleshock...
- Ogres. I mean, they're both heavy armoured AND quite singular models! I don't have faced them often, but I suggest to use your Troglogon as a support option: try to get their attention but stay safe using your high Move characteristic, and leave the hard work to the rest of your army (mages, salamanders, rippers, ecc.)
Sorry for the wall of text, but I hope this will make clear that yes, I find the Troglodon a lot more than marginally decent!
