I would suggest playtesting this if you can, as that can help give a more direct impression of the impact. YMMV, but in my opinion counterspelling is one of those mechanics you don't actually want to be too good: in another tabletop game we probably all know about, Counterspell is a thing you can do for any spell, just by expending a spell slot, and combat against spellcasters often devolves into pressing the "nope" button against each others' spells (including noping that nope button), which leads to a lot of wasted resources and turns and a lot of associated frustration. The fact that it won't happen often is in my opinion a good thing, and encouraging the Wizard to research a particular opponent's spells and prepare them just for the purpose of counteracting them to me is a good way to lean into the class's fantasy.
Where I can agree that there's disappointment, however, is in the effectiveness of counteract checks: if you're fighting a higher-level spellcaster, your counteract check is likely to fail, and because their spell will almost certainly be of a higher rank than the spells you can cast, your spell will fail to counteract theirs. Thus, Counterspell can easily be ineffective during some of the few times where it comes up. If you think Counterspell is effective when it comes up, then don't mind this, but if not, you could always play with some kind of a bonus to your counteract check, or even a bump to the check's degrees of success, so that when the opportunity comes up to counter an opponent's spell, your caster will be very likely to counteract it.
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I rule that having Dispel Magic prepped counts as having "the same spell" prepared. This means they can load up on Dispel Magic if they want to be counterspelling a lot, or they can research their enemies to memorize the correct spells so they have more options on hand.
The Counterspell Feat for a wizard is a React which to me I believe everyone only get's one a round. I am not as worried regarding it becoming counterspell ping pong for that reason. You get to counterspell and they can try to counter your counterspell and that's it.
That is the counterspell ping pong. Characters only get one reaction in D&D 5e, and that's enough for Counterspells to start flying all over the shop. PF2e at least has the benefit of Counterspell itself not counting as a spell, so you can't nope that nope, but the fundamental problem remains the same: if your "nope" button is overly broad, that's going to lead to lots of turns where essentially nothing happens, because someone's spent a resource to cast a spell and you've spent a resource to make sure that spell doesn't get cast, and vice versa. It's fine when it's a thing that occasionally happens, not so much when it happens all the time.
This is what we have for our house rules for Counterspell every spellcaster has access to it. We have not had any issues with this.
Counterspell Feat 1
When foe Casts Spell and can see its manifestations, can use own magic to disrupt it.
Trigger: A creature Casts a Spell
Requirement: Have an unused spell prepared.
[RA] Expend a prepared spell. Attempt Counteract at Spells Rank vs triggering spell.
If prepared spell expended matches triggering spell's Tradition, +1 Counteract check.
If prepared spell is Dispel Magic or a similar spell, +2 Counteract check.
If prepared spell matches triggering spell exactly or specifically states can use to counter triggering spell (Bane and Bless), +3 Counteract check