I love the idea of Punisher, and his red is awesome… but his other powers are a little weak.
Green has solid strike tiles and the low damage is irrelevant… but why does it have to be random placement…? make it targeted and it is suddenly very strong.
Black… the AoE damage is low, but the Attack tile is nice. Either up the AoE damage… or have the count down tile do some damage when it hits 0 as well as create the Attack tile…
If he had targeting on Green and a damaging countdown tile on Black then I think he would be very very useful…
as it is, when pooled with big AoE users he is a very tidy finisher 
And I think that has to be the goal… slight Buffs to make them useful rather than massive reworks should be fine… but also just tweaking damage numbers is rarely the right play.
I think the IM40 maybe went too far, he is really tough to pass up even in a 4* rich roster… but that was due to the yellow change, not damage
I LOVE Quicksilver now… he is one of my favourite characters to use, so they did a great job of making him relevant and fun. This was a damage thing, but the functional shift from Crit tiles to locking tiles was great
Vision, they tweaked his damage and yet didn’t sort out the ridiculous limitations on his Red while his Light Density tile is out… seriously, why not any special tile at 5 covers??? He then becomes an interesting damage soaker with control elements when in Light mode, and a damage dealer in Heavy Mode. Though Heavy Mode is tough to make work due to the need to tank colours… so this was a case of close, but no cigar. If they had tweaked the function (Better tile removal and global damage, or even make the Blue Countdown do some damage as it ticks down, which then benefits from the “Heavy” boost) then he would have been interesting.
Squirrel Girl - Lower Green AP cost slightly and get rid of the “End turn” on Yellow… she would be solid. She fills her niche well, but nobody ever uses the yellow power and green is awesome but slow and expensive
Psylocke - Bewilder needs to be more effective (pick colour or do something akin to OBW aggressive recon and hit more colours as it goes up levels), and maybe a minor damage tweak…
Sentry and Ragnarok… these guys do need a rework.
Doc Ock - Reduce cost of blue, or let it remove countdown tiles or have some damage when there is nothing to remove. Green just needs to be re-worked… pick something and do it well…
Spidey 3* - Just change yellow to something else, maybe something that does some damage and puts out Web Tiles.. and make purple be like Bullseye 2*
Colossus - Reduce Black and Yellow cost… he’s good but is too hard to get going… or let his yellow tile reduce his other power costs…
Hulk - Better red please
Gamora - the black is too situational, the green too weak and the red not damaging enough… Maybe if she got some burst healing while there are strike tiles on the field as a passive element of the black would make her more interesting as a tank…
Dr Doom - Summon Daemons is a bit weak and the fact that trap tiles get over written is a pain.
Daredevil - Stop trap tiles being overwritten, give purple something to do when there are no enemy tiles out there…
Storm - make here unrestricted like the 2*, her Yellow maybe needs a bit of a kick
Mystique - I just think her blue is a bit over-costed, if cheaper it would speed things up… maybe the purple needs a better stun…