It's fine to not enjoy Pathfinder, but it seems hard to not enjoy it if you did like 3e/3.5e.
My gaming group has been playing D&D for a long time. We have played 3.0, stock 3.5, and are currently playing Pathfinder Beta, using 3.5e adventures, with most of the 3.5e splatbooks allowed for the characters. And it works fine, and we're really enjoying it.
My Pathfinder cleric has found that some feats and p-classes don't make sense any more (the changes to the domain system make some domain feats not make sense, and the new channeling energy rules make some of the old divine feats seem too weak to take) but in general, it's all the same stuff.
You can play stock 3.5e alternate base classes, take (most) 3.5e prestige classes, use (most) 3.5e feats, use 3.5e spells... You can use stock 3.5e monsters and adventures. It's as compatible as 3.0 to 3.5e, and way more so than 2e->3e or 3.5e->4e.
They made the base classes a little more competitive with the higher-power stuff the 3.5e splatbooks presented. They're not outclassing them though, I still want to take one level of Crusader from Tome of Battle for the sweet, sweet kung fu cheese...
Is it "just house rules to make 3.5e better?" Sure. It's professional designed house rules, which will then have adventures and supplements written for them by a company who has put out the best adventures published for D&D since First Edition.
Our circle of gamers around here have a bunch of campaigns going in various game systems - Savage Worlds, White Wolf, etc. - and of the campaigns that are D&D, they have all migrated off 3.5e and are doing Pathfinder Beta. There were some one-shots of 4e but no one expressed interest in going further with it.
Anyway, random pontification is fine and all, but we're actually playing the thing extensively and using it to interoperate with 3.5e - and it's hot!