It's entirely up to you if you want to read them - I've recently been revisiting them as they were my favourite books when I was in my early teens.
if i was still into reading i'd get the books published after scorpia rising which i've not read, maybe i still will
The villain in Stormbreaker was pretty weird for a computer company CEO - a sleazy Middle Eastern guy (a little like a very exaggerated version of someone like Stelios of Easy Jet, although he's Greek) who attended the same school as the fictitious prime minister in the book. I'm amazed that the prime minister hadn't suspected that anything was wrong with the guy when he had a huge private army to guard his base in Cornwall.
It was my Year 5 teacher who got me into Alex Rider - he was born in around 1980 and remembered reading Horowitz's earlier Diamond Brothers books growing up, and he often read his books to us at the end of each school day.