A little rundown of my opinions on the regional evolutions in Galar:
Obstagoon:
I was pleasantly surprised when Obstagoon was revealed, if someone told me ten years ago that one of the regional rodents would get an evolution and no longer be stuck as a fully-evolved pokémon with a subpar BST, I wouldn't have believed them. Obstagoon has a very nice stat distribution, 93/101/81 are some solid defenses and its speed stat of 95 is higher than I expected. Its attack is a little low on its own, but all its abilities are able to boost it, with Guts being the best of the bunch. My only main negative critique would be of its appearance, Obstagoon's humanoid design looks a bit awkward and I think it would have looked better with less of the gray fur.
Rating: Excellent Punk Badger/10
Perrserker:
I must say I was a bit perplexed when I first saw Perrserker and wasn't sure how I felt about it, but it has certainly grown on me since. If we put nitpicking about viking helmets not actually having horns aside, I do think the alternate evolution idea of Perrserker is very interesting. I kinda like that it is so different from (both) Persian, its appearance makes it look like an even more feral and roughed-up version of Meowth. However, since Perrserker is more of an alternate evolution rather than an additional evolution, it shares Persian's rather lacklustre BST. Honestly, I think they should have increased (both) Persian's BST and also given Perrserker a higher BST to begin with.
Rating: Rowdy Viking Cat/10
Cursola:
I was so glad that Corsola finally got some love, even if in a somewhat unexpected way. But WOW is their concept depressing! Even if the lore for G. Corsola/Cursola mentions that their extinction happened way in the past in the Pokémon world, it is definitely edging too close of being Too Real. With that said, I'm still glad that they are giving attention to climate change and its effects. Statwise, Cursola has a really awkward stat distribution. Its Sp. Attack and Sp. Def are amazing, but its held back by its very low HP and Defense. And for some reason it has a somewhat high Attack stat. What? But what makes Cursola quite frustrating to use in battle, is its abilities. Weak Armor makes it really hard to face any physical attacker, the Defence loss also nullifies the benefit of Strength Sap. Its Hidden Ability is similarly frustrating, since the Perish Song effect will force you to switch out Cursola often. So I must say: please Game Freak, let Cursola have another ability.
Rating: Always Protect/10
Sirfetch'd:
Much like Corsola, Farfetch'd has also been in need of some love for a long time, and I'm glad we got it in the form of Sirfetch'd. I'm still slightly bummed that it isn't Fighting/Flying, but I can see how it makes sense, since neither G. Farfetch'd or Sirfetch'd can really put away their leek in their mouth anymore to be able to use their wings for flight. On the other hand, we have cases like Doduo/Dodrio that are Flying-type anyway. Statwise, Sirfetch'd is pretty solid, though I wish that it had slightly less Attack for a bit higher HP. Its movepool is definitely unusual compared to most other pure Fighting-type pokémon, but I also feel like it is missing some move options that most other Fighting pokémon have. Most notably I would say is the lack of Rock- and Ground-type moves.
Rating: Fantastic Gallant Knight Duck/10
Mr. Rime:
Somehow somewhat less cursed than Mr. Mime. I guess face torso is less creepy and unnerving than Mr. Mime's dead smile. With that said, Mr. Rime is indeed strange and confusing. G. Mr. Mime is faster than regular Mr. Mime, but as it evolves it becomes slower again. Huh? Also confusing is the fact that the Psychic/Fairy-type Mime Jr. becomes Ice/Psychic rather than Psychic/Ice as it evolves, effectively switching its primary type to be its secondary type, which I'm pretty sure is unprecedented. Mr. Rime's stat distribution is remarkably even, especially in contrast to regular Mr. Mime who had a very uneven stat distribution. This makes it so its Attack is actually its third highest stat, which is definitely strange. And Mr. Rime's movepool is very large, it has so many options available. It somehow even learns Slack Off. What.
Rating: Still Cursed/10
Runerigus:
I never knew I needed this cursed and possessed runestone pokémon so badly until Pokémon Sw/Sh. I adore its design, it is similar to Cofagrigus but somehow I just think it works better. With that said, I do have some critique about it. I think it is a bit boring that Runerigus got the same stat distribution as Cofagrigus, save for switching Attack and Sp. Attack. Also, being primarily a Physical attacker makes it somewhat awkward with its ability. In some battles you just end up switching Wandering Spirit back-and-forth, with Runerigus never actually being able to take advantage of the opponent's ability. And as a Physical attacker, it doesn't really have any options to raise its Attack stat, unlike Cofagrigus which has Calm Mind or Nasty Plot to raise its Sp. Attack. I really wish as well that it was Rock/Ghost-type instead, considering 1. we haven't had that combination before, and 2. it is based on a runestone, which are raised natural rocks that has had runes inscribed on them.
Rating: Why Not Rock-Type/10
Overall, I wish there had been a few more regional evolutions in Galar, perhaps one more alternate evolution like Perrserker/Runerigus and one more evolution like Cursola/Sirfetch'd of another pokémon in need of attention. I also hope that eventually that the regular forms recieve their own separate evolutions in later instalments, basically giving them evolutions like Perrserker/Runerigus but in reverse order.