Tutoring is great
And just as with everything other great thing in this world, there will always be critics
Tutoring can be used as 'forced motivation', forcing you to study even when you've lost focus at school
Tutoring can be used to catch up on work that you've missed out on school (for whatever reason)
Tutoring can be used if you feel your school is too slow and you want to get ahead, but you're not sure how to study yourself
And last but not least, tutoring can be used if your teachers are shit
Depends how willing you are to spend money I suppose