Johansen was certainly a relatively risky acquisition, coming off of a major injury and with known issues with consistent effort. But, on the other hand, our coach knew the player well, his retained contract fit very well into our cap puzzle (we have the Landy space this year, the cap bump next year covers his salary, and he expires when Rantanen and Byram are up for extensions), he didn't cost any assets except cap space, we haven't seen "playoff RyJo," and, if the experiment fails hard, I don't think it's that difficult to move an expiring contract.
I also don't think there was any other legitimate 2C that moved during the deadline last year (Horvat was in January) or this past off-season, so you can't claim that the Avs got outbid for someone. Compher was the shiny UFA center prize, and for obvious reasons, he wasn't coming back.
I think looking back at the Tatar signing thread, most posters were very excited about the Tatar acquisition (I remember because I was rather skeptical having watched him in the postseason a few times). Obviously, it hasn't panned out yet, but it's very little risk, almost fully buryable contract, and maybe he still gets hot and provides some secondary scoring.
The whole second line horribly misses Lehkonen to do the grunt work or a top 20 NHL player like Mikko to carry it (as he did Compher's line for much of last season).