Oh trust me, Erza becomes so bullshit with what she can do later that it gets a little boring. Almost every fight she becomes incredibly crippled but wins in the end, because main character. Natsu doing that is only because so little is known about Dragonslayers until much later.
Fairy Tail is also known for its weird power levels, changing drastically from arc to arc or even fight to fight.
Don't get me wrong, I like the series, but it's got some pretty glaring flaws. I'd put it higher than Bleach (definitely) and Naruto (personally).