having done some research on that matter I must say that hard tackling (might go without saying for some of you) is quite dangerous with a low tackling stat. I have tried the same position with hard tackling and different players. 3 players who had 15 and above tackling, had a few yellow cards, no sending off.
1 player who had 13 tackling got 3 red cards and several yellow
2 players with below 10 tackling didn't cope at all, got a few red cards, lots of yellow, but more importantly, they missed their tacklings which resulted in getting more goals.
This was tested over the course of a season, including pre-season, against opposition of various levels. I tried to keep a good alternation of tackling level, so I have good, mediocre, bad tackling against each level of competition, in order to keep this test somewhat valid.
I have done this a while ago, so I won't be able to give you detailled information anyomre, unless I wrote it down somewhere... it was on 7.0.2 though