Deer Creek is OK but would definitely be in the second or third tier of courses in the Youngstown-Warren-Sharon, PA-area. The power lines and two short 90-degree doglegs are drawbacks. Doughton Golf Course in Hubbard closed about 5-10 years ago. Donnybrook, a 9-hole track back in the day near Deer Creek, may be closed, too. I'm playing at Pine Lakes tomorrow. They built some new holes there about 10-15 years ago and were planning on a small housing development in the spaces vacated by the old holes, but it was at the height of the housing crisis (2008-2009...?) and the project never got off the ground. Candywood Golf Course in Vienna closed about 5 years ago, as did Diamondback (Leffingwell) out in Canfield, along with a few others in the tri-county area.
Stambaugh Muni, a 9-hole track operated by the city of Youngstown on the north side, is an interesting layout with a short but tough opening par 4; a tee shot you have to hit over a fenced road crossing at Fifth Avenue (#7); then the 625-yard all downhill par 5 (#8), and a challenging uphill par 4 (#9). Unfortunately, I don't think it's opened this year due to the virus restrictions.
Oak Tree is a very nice layout, with well-designed and challenging holes, and a good visual vibe. But money woes and ownership power struggles have resulted in some neglect and very limited pro shop and beverage/food options.
The king remains Ron Klingle and his Avalon Holdings Group. They own and operate Avalon Lakes (a Pete Dye design), Squaw Creek, Avalon at Buhl (former Sharon Country Club), and now the former New Castle Country Club. Membership allows for play at all four courses, and they have developed a robust separate social membership program with activities and bar/restaurant/pool/outdoor dining at all locations.