Ha, yes, XH did that thing too. His way of proving the marriage had not irretrievably broken down was to point out all the things that I had done wrong too 
I think he had a sort of view that the court would find in favour of the most deserving case, which was obviously him, and he didn't want the marriage to break down so they'd say I had to either stay or walk away with nothing. Don't worry, they didn't! It was 50-50 in the end, which under the circumstances I considered fair. (I was the main earner.)
Two colleagues were divorcing at the same time and they both got done over pretty brown, by their own solicitors as much as by their exes. Their solicitors were a lot more expensive than mine, too. So paying a lot doesn't guarantee a good service. It's more important to find one who's experienced at divorce/family law, who is pragmatic over which battles are worth fighting to the bitter end and which are better to concede, and who is unquestionably on your side.
Oh, and of course, no 1 rule: do not trust a word your ex or his legal advisers utter. Until it's been nailed down on paper, crawled over by your legal adviser and if appropriate an accountant, and stamped by a court, nothing, but nothing, should be taken as agreed.