My objection was not to Manakete, although Manakete is not the best class in the game. Sorcerer is pretty clearly the best class. Manakete is very good, though.
That said, Taguel... The only reason I won't declare Taguel is the absolute worst class in the game is because Sniper might be (or Villager, I guess, if you want to get technical). Those two classes are so much worse than all the rest that it's sick.
i like the beaststone+, but i admit that taguel suffers a bit more than the high tier classes. although, calling it the worst class in the game is a big stretch. that honor goes to war monks/war clerics. the valkyrie in this game is also really terrible, although its somewhat useable in other fire emblem games.
using yarne as a class that wields weapons is not a bad call. he's just really difficult to make into a front liner without actually sacrificing something important to do it. the pair up boosts from taguel are also pretty good, so hes a good supporter.