Yes, some of the older Tamiya kits are very nice even today. The Japanese WW2 tanks, Chi-Ha and the SPG are especially nice for 1970s kits. The M3, M5A1 and M8 Stuart light tanks are not bad, but the tracks are inaccurate and need replacing to bring them up to current levels.
The M41 Walker Bulldog is decent, but very dated and often a kit recommended for a beginner, but light years behind the current state of the art Bulldog kits (Skybow and AFV Club, now both owned by AFV Club).
One of their worst kits is the Panther A that stays on the shelves. It was surpassed by other Panthers in the 90s, but they still sell at places like Hobby Lobby.
Their US half tracks weren't bad, but again have been surpassed by uber kits by Dragon. Just about any of their kits from the 80s and 90s were bettered by other companies. Many of Tamiya's kits remain at the top of their subject though.