With all due respect, thats crap. Fifa 08 and Fifa 09 are VERY similar in most all aspects of gameplay (and the ones that matter definitely). You cant love one and hate the other.
All your post illustrates to me is that - if you found fifa 08 crap and pes 2008 good and fifa 09 good - those two 'good' games must have a hell of a lot in common, which coincidentally they do. Fifa 09 is FAR too fast, FAR too easy and FAR too arcade.
My gut says given the success this formula gave them, fifa 10 will be similiar. Iterations will continue becoming more arcade until it reaches the point that PES6 did - where people realise it (too arcade) and turn to the less accomplished but more realistic competitor. Then the cycle begins again.
Saying that you had your most realistic football experience playing manual in 09 just means it was your most enjoyable football experience - fast, goal fest, and excellent animations. It might have seemed realistic because 09 does have excellent animations all around. Go watch youtube highlights if you want a goalfest.
There is no doubting that 08 is far more realistic (the more informed community agrees on this point), while being built on essentially the same gameplay. The key differences are the speed of the game, the ease of tackling (harder in 08) and the smarter defenders in 08.