As much as I love using stats to back up arguments this is an example where they are being misused. If the best 'keeper in the country was at, say, Blackpool last season he'd have conceded a shedload. Not because he's crap, just because he's behind a terrible defence and would be constantly exposed.
You couldn't just use goal against stats to demonstrate how poor he is.
If we take the (thoroughly enjoyable) 92/93 season as an example:
http://www.statto.com/football/teams...992-1993/table
Yes, we could raise it for the odd cup game, and we did, but we were a very dull, mid-table side that year. We finished 10th, 28 points off the title, only 7 points off relegation. We only won 15 league games out of 42, we drew 11 and lost 16. We only scored 40 goals!
But, and here's the point, we only conceded 38 league goals that year. Fewer than this season's 43 (and we only have 38 games now). Despite our general mediocracy we had the 2nd meanest defence in the league.
Right now we're a top 4 side with a mid-table (at best) defence. We tend to dominate games so we don't concede
that many but we concede far more than the rest of the top 4, the teams we should be comparing ourselves to. We concede far too many goals from set pieces and long balls - the sign of a poorly organised defence. And we regularly crumble under pressure and drop points from winning positions.
Back in the season I'm talking about we were a mid-table side with a title-winning defence. Yes, they sometimes conceded more goals than Wenger sides often do but for their mid-table level they did exceptionally well. For our current top 4 level our defence does exceptionally poorly.
Bottom line if you're 1-0 up with 10 minutes left which defence in its prime would you want out there? Graham's all the way.
But overall I'd pick Wenger over Graham as manager in a heartbeat.