Of course you are entitled to an opinion. Service in the military of this country is voluntary and as such it is right and proper that you voice concerns over potentially illegal weapons you might be called on to use.
My opinion is that although I find mines distasteful by signing up to bans such as this we are just crippling our forces in their fight against people who have signed up to no conventions and will happily use every trick in the book to get what they want. How many besieged outposts in Afghanistan would have been a little less besieged if the ability to lay mines in dead ground was still in the armoury?