I hear people constantly talk about how they don't have runes so they can't jungle but I want to know how much you gain from runes.How much can runes impact the game?What all the average stats of a normal t3 ap/ad rune page?How much do they compare to items in game like doran's ring?
They matter a massive amount.
It's really noticeable if you do a jungle clear with runes and without runes (same champion, same path). One will leave you pretty healthy and you will be lucky to survive the other.
Many junglers cannot effectively clear without a rune page. Basically it works out like this:
Marks: Usually 8.5 AD or 15.3% AS from marks. Seals: Usually 9 armor or 72 health Glyphs: Many junglers use either scaling MR or CDR, neither of which have a huge impact on their jungle but are useful for other reasons. Quints: This varies based on personal preference. It's not uncommon to see 13.5% AS (4.5% per quint), or 4.5% Movement Speed (1.5% per quint), or 6.75 AD (2.25 per quint), or a mixture of those three.
I'd estimate that in many cases, you're looking at around 1000g in stats from your rune page. For instance if you have 29% attack speed and 9 armor from your marks, quints, and seals, that's about 905g worth of stats and doesn't take into account whatever glyphs you're using.
Your masteries can further assist you in your jungling depending on what you choose.
This is why I dislike the current state of the game for new players. They can't really learn how to play the current meta when they don't have masteries or good runes.
Runes=early game, aside from CDR and Crit runes.
Aside from that scaling runes are mid-game.
