Blackball rules make the game a lot better, the older (and still used, but not as widely) World Rules were far more negative.
As for the table size, its just a practical thing, but given the pocket size and cut I think it can still be harder to pot a ball close to the rail than on a 9ft American style table.
The small cue ball is stupid, I wish they would change that.
Personally I would like to see 7ft Chinese style tables (i.e. snooker style pockets, but everything else the same as a 7ft US bar box), I think that would be a great way to start standardising pool around the world.
All that said, the IPA tour in the UK seems to be going from strength to strength, they are even showing matches live on free to air TV from next month, which frankly is pretty amazing. They also have a tie in with a leading UK bookmaker and sports bar chain.
So for me, if the choice is between a 9ft American table or a 7ft English table, I'd go for the American 9/10, but if they are both 7ft, I'd probably opt for the English table...although if someone ever makes a rounded pocket table for American pool balls I'd definitely give that a go!