These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Game Breaker: in the first game, Humans have a tower that shoots arrows, while Elves have a tower that shoots ice bolts that freeze the enemy for a few seconds. If you are in a map where you can use both, put two or three of each tower in a bottleneck and laugh as no enemy can get through!