I agree that is a fair summary. His first season (which I think was more like two-thirds of a season) was very encouraging, he was our "go to " centre back as compared to Balatoni and the frequently injured Seaborne, and he capped it off with a fine and very important goal at Ross County. There was talk of him moving up a level when the time came for him to leave us.
His second season just never got going. He was sent off in the first game at Hamilton, had niggling injuries, scored a horrendous own goal at Motherwell, and when he did begin to knock on the selection door found it difficult to displace a rapidly improving Lindsay and a more regularly available and reasonably effective Seaborne. He was part of the infamous 3 centre backs without a ball-playing sweeper experiment in the dreadful Scottish Cup tie at Tannadice, and by the time he secured a spot in the starting line up the season was just about over.
So I tend to agree that he is a decent player and a good character, and there would be some encouragment in our being his team of choice over two of our rivals, but definitely not worth over-stretching the budget for.